When Dandadan first introduces Seiko Ayase, she appears to be exactly what she claims: a fake medium fumbling through a television interview, getting every prediction wrong while an idol group member smiles uncomfortably beside her. Then she steps out of the taxi, senses something terribly wrong, and proceeds to absolutely demolish one of the series’ most dangerous spirits with nothing but a baseball bat and some nails.
That moment—when Seiko transforms from comedic relief to terrifying powerhouse—encapsulates everything that makes her one of modern anime’s most memorable characters. She’s a seventy-something grandmother who looks like she’s in her twenties, chain-smokes with casual indifference, and wields spiritual powers that would make most exorcists weep with envy. More than that, she’s the emotional anchor of a series that thrives on chaos, providing wisdom, protection, and an endless supply of sarcastic commentary.
Who Is Seiko Ayase? The Fake Medium Who’s Anything But Fake
Seiko Ayase is the grandmother and legal guardian of Momo Ayase, the series’ female protagonist. By day (or rather, by television appearance), she performs as “Santa Dodoria“—a stage name that belies her genuine spiritual expertise. The joke, of course, is that everyone thinks she’s a fraud. The news anchors mock her. The idol guests laugh nervously at her wild predictions about their secret marriages and true ages. Even Momo, her own granddaughter, has called her a fake to her face.
But here’s the thing: Seiko’s predictions are always correct. Every embarrassing secret she outs on live television? It gets confirmed by tabloids days later. The celebrity who laughed at her favorite food guess? Turns out she was right about that too. Seiko isn’t a fake medium playing dress-up for TV ratings. She’s a genuine spiritual powerhouse who uses her public persona as cover, letting people underestimate her while she quietly works to protect her city from threats most humans never even perceive.
Her physical appearance adds another layer to this deception. Seiko looks nothing like a grandmother should. With her sharp features, voluminous white hair styled into dramatic spikes, red glasses, and perpetually unimpressed expression, she could easily pass for Momo’s older sister. She’s almost always dressed in casual sportswear with a belly band, carrying her signature metal bat labeled “Power of Nessie” like a delinquent heading to a street fight. The contrast between her youthful looks and her actual age—somewhere between fifty and seventy, though the series keeps it deliberately vague—is a running gag that never gets old.
Personality-wise, Seiko is a study in contradictions. She’s crude, foul-mouthed, and has absolutely no filter when it comes to teasing Momo about her obvious crush on Okarun. She’s also deeply compassionate, taking in stray kids, feeding everyone elaborate crab hotpots after battles, and refusing payment for her exorcism work—instead asking clients to “pay it forward”. She’s stubborn and skeptical, insisting aliens don’t exist even after literally being kidnapped by aliens, yet she’s flexible enough to admit when she’s wrong (though she’ll grumble about it the entire time).
This duality—the tough exterior hiding genuine warmth, the comedic eccentric who’s also a tactical genius—is what makes Seiko feel like a real person rather than just a collection of quirky traits. She’s the kind of grandmother who will threaten to kill anyone who hurts her family, then turn around and organize a barbecue to welcome new friends into the fold.
Seiko Ayase’s Powers and Abilities: Why You Should Never Underestimate Granny
Let’s get one thing straight: Seiko Ayase is terrifying in combat. Despite looking like she’d lose an arm-wrestling match to a stiff breeze, she possesses a suite of supernatural abilities that make her one of the most versatile fighters in the Dandadan universe. Her power set breaks down into several distinct categories, each impressive on its own and devastating when combined.
Enhanced Physicality: The Granny Who Hits Like a Truck
The first thing you notice when Seiko fights is that she’s strong. Not “fit for her age” strong—we’re talking “shattering the ground with a single swing of her bat” strong. She can send powerful yokai like the Evil Eye flying across rooms, create craters in concrete, and trade blows with supernatural entities that would pulp normal humans.
Her speed and reflexes are equally absurd. Seiko dodges attacks in close-quarters combat with an almost casual ease, moving like she’s already seen everything coming (which, as we’ll discuss, she probably has). She’s trained Momo in chi manipulation since childhood, and it shows—her control over her own physical energy is so refined that age seems to have no effect on her capabilities.
Mediumship and Mystic Barriers: The Art of Spiritual Geometry
Seiko’s primary supernatural ability is her connection to the local land gods of Kamikoshi City. She can borrow power from these deities to create mystic barriers—essentially force fields of spiritual energy that can trap, contain, or incinerate evil spirits.
The mechanics of her barrier technique are fascinatingly specific. Using her bat (which doubles as a giant pencil), Seiko draws circles on surfaces. She then drives special “charm nails” into these circles. If the nail goes inside the circle, the interior becomes a protective barrier. If the nail goes outside, everything beyond the circle becomes trapped. This geometric precision requires immense concentration and spiritual control—one wrong placement, and the barrier either fails or backfires catastrophically.
When fortified properly, these barriers become lethal. Seiko can ignite the space inside a circle, reducing hostile spirits to ash within seconds. She demonstrated this against Turbo Granny, trapping the powerful yokai in a barrier that set her ablaze despite the spirit’s attempts to counterattack.
The catch? Seiko’s barriers are geographically restricted. They only work within Kamikoshi City—the domain of the gods she borrows power from. Outside this area, her abilities diminish significantly, forcing her to rely on her physical prowess and whatever tools she’s brought along. This limitation becomes a crucial plot point, explaining why she can’t simply solve every problem herself and why the younger characters must step up.
Precognition: Fighting Before the Fight Starts
One of Seiko’s most underrated abilities is her precognition. She consistently demonstrates the ability to foresee enemy movements before they happen, giving her a massive tactical advantage in combat.
During her confrontation with Turbo Granny, Seiko predicted a sneak attack that should have caught her off guard and had a barrier ready specifically to counter it. This isn’t just combat instinct or experience—though she certainly has plenty of both—but a genuine supernatural ability to perceive future events. It allows her to fight several steps ahead of her opponents, turning what looks like a reactive defense into an elaborate trap.
The Power of Words: Reality-Altering Speech
Perhaps Seiko’s strangest ability is what fans call the “Power of Words.” By shouting a word with absolute conviction, she can temporarily alter reality to enhance her attacks. This isn’t metaphor—when Seiko screams “POWER!” while swinging her bat, that swing actually becomes more powerful through sheer linguistic force.
This ability ties into broader Shinto and Japanese folkloric concepts about kotodama (言霊)—the belief that words carry spiritual power and can influence the physical world. Seiko’s version is particularly potent, allowing her to buff herself mid-combat by essentially talking her way into greater strength.
Combat Mastery: More Than Just Raw Power
Seiko isn’t just a supernatural powerhouse; she’s also a highly skilled martial artist. Her fighting style revolves around her bat, “Nessie” (named after the Loch Ness Monster, which Momo believed as a child was the strongest creature alive). She switches seamlessly between one-handed and two-handed grips, adapts her stance based on her opponent’s movements, and incorporates talismans and charm nails into her combos for maximum spiritual damage.
What makes Seiko truly dangerous, though, is her tactical mind. She doesn’t just overpower enemies—she outsmarts them. Against Turbo Granny, she baited the spirit into specific positions, set up barriers in seemingly random locations that turned out to be perfectly placed, and never once lost her cool despite facing one of Japan’s most infamous yokai. She fights like someone who’s been doing this for decades because, well, she has.
Seiko’s Role in the Story: More Than Just a Mentor
For all her power, Seiko isn’t the protagonist of Dandadan. She’s the mentor—the wise (if eccentric) elder who guides the younger characters while letting them fight their own battles. But unlike many mentor figures in shonen anime, Seiko doesn’t conveniently disappear whenever the plot needs the kids to struggle. She’s an active presence throughout the series, and her relationships with the main cast drive as much emotional weight as any battle.
Seiko and Momo: A Complicated Love
The heart of Seiko’s character is her relationship with her granddaughter, Momo. These two love each other fiercely, but they express it in the most dysfunctional ways imaginable. Momo has spent years dismissing Seiko’s spiritual work as fraud, lashing out with the casual cruelty that teenagers specialize in. Seiko, for her part, has absorbed those hits with a stoic exterior, but they’ve clearly wounded her.
When Momo finally apologizes—genuinely, deeply apologizes, getting down on her knees and admitting she was wrong—it’s a watershed moment for both characters. Seiko’s response isn’t tearful or dramatic. She simply accepts the apology and moves on, the way someone who’s always believed in forgiveness does. But you can see the relief in her eyes. This isn’t just about being right; it’s about being seen by the person she loves most.
Throughout the series, Seiko pushes Momo to develop her psychic powers while also respecting her granddaughter’s autonomy. She doesn’t fight Momo’s battles for her, but she’s always there with advice, training, and the occasional well-timed intervention. Their relationship is a masterclass in showing how love can coexist with frustration, pride with humility, and fierce independence with the willingness to lean on family.
Seiko and Okarun: The Reluctant Acceptance
When Okarun first appears in Seiko’s life—possessed by Turbo Granny and drooling threateningly over her unconscious granddaughter—her immediate reaction is to try to kill him. It’s not personal; he’s just a vessel for a dangerous spirit, and Seiko has zero tolerance for threats to her family.
But as the situation unfolds, Seiko warms to Okarun in her own abrasive way. She recognizes his potential, his genuine care for Momo, and his desperate desire to become stronger. She trains him (in between making crude jokes about his obvious crush), pushes him to master Turbo Granny’s power, and eventually comes to see him as part of her extended family.
Their dynamic is hilarious specifically because it’s so normal. Seiko treats Okarun like any grandmother would treat her granddaughter’s awkward boyfriend—alternately teasing him mercilessly, feeding him enormous meals, and threatening dire consequences if he steps out of line. The fact that she could actually follow through on those threats makes it even funnier.
Seiko and the Supernatural World: The Expert in the Room
Beyond her personal relationships, Seiko serves as the series’ primary source of exposition about yokai, spirits, and the rules of the supernatural world. When the kids encounter something they don’t understand, they go to Granny. She explains the nature of location-bound spirits, the history of Turbo Granny, the mechanics of curses, and the limitations of her own powers with a straightforwardness that cuts through the chaos.
This role is crucial for Dandadan‘s pacing. The series moves at a breakneck speed, throwing new monsters and concepts at the audience every few chapters. Having Seiko as a stabilizing presence—someone who knows what’s happening even when everything seems incomprehensible—keeps the story from becoming overwhelming. She’s the anchor in the storm, the calm voice explaining the rules while everything else goes insane.
Seiko’s Impact: Why Fans Can’t Get Enough of This Granny
Since her introduction, Seiko Ayase has become a fan-favorite character for reasons that go far beyond her combat abilities. She represents something rare in anime: an elderly female character who’s powerful, complex, sexualized (in a way that’s empowering rather than exploitative), and cool.
Subverting the “Old Lady” Trope
Anime has no shortage of powerful old men. Master Roshi, Genkai (who’s technically an old woman but presents as young), Netero—the “wrinkled master who can still kick ass” is a well-established archetype. But truly powerful elderly women who own their age (or lack thereof) are much rarer.
Seiko subverts expectations at every turn. She’s not frail or nurturing in the stereotypical grandmother way. She’s sarcastic, crude, and perfectly happy to let people underestimate her before proving them spectacularly wrong. Her youthful appearance isn’t played as a tragedy or a deception—it’s just a fact of her spiritual abilities, and she’s completely unbothered by it.
At the same time, she is nurturing when it counts. She feeds the kids. She worries about them. She holds Momo tight before sending her into danger, praying for her safety even though she knows her granddaughter has to fight her own battles. Seiko embodies the idea that strength and softness aren’t opposites—they’re two sides of the same coin.
The “Cool Granny” Factor
Let’s be honest: part of Seiko’s appeal is pure style. The woman has presence. From her dramatic hair to her red glasses to the way she casually smokes while explaining complex spiritual mechanics, she exudes an effortless cool that’s rare in any character, let alone a grandmother.
Fans have drawn comparisons to Bayonetta—another glasses-wearing, white-haired, impossibly stylish woman who fights with casual grace and a healthy dose of sass. The comparison fits, though Seiko is distinctly her own character. She’s less theatrical than Bayonetta, more grounded in her eccentricity. She’s the kind of grandmother who’d teach you to fight demons, then make you clean up the mess while she watches her favorite TV show.
Representation Matters
On a deeper level, Seiko resonates because she offers a vision of aging that’s aspirational rather than depressing. She’s in her seventies (probably), and she’s still active, powerful, attractive, and deeply engaged with life. She’s not fading into the background or waiting quietly for death—she’s fighting monsters, mentoring the next generation, and living on her own terms.
For younger viewers, Seiko offers a glimpse of a future where aging doesn’t mean losing yourself. For older viewers, she’s validation that their best years aren’t behind them. And for everyone, she’s simply a fantastic character who happens to be a grandmother, rather than a grandmother character who happens to be fantastic.
Frequently Asked Questions About Seiko Ayase
How old is Seiko Ayase?
The series deliberately keeps Seiko’s exact age vague, but based on context clues—she’s Momo’s grandmother, Momo is 15-16, and assuming standard generational gaps—Seiko is likely between 50 and 70 years old. Her youthful appearance comes from her spiritual abilities, possibly from borrowing power from the local gods or from advanced chi control. The ambiguity is intentional, allowing the “young-looking granny” gag to remain fresh while keeping Seiko’s mystique intact.
What are Seiko’s main powers?
Seiko possesses enhanced physical strength and speed, the ability to create mystic barriers using circles and charm nails, precognition (the ability to foresee enemy movements), the “Power of Words” (reality-altering speech that enhances her attacks), and extensive combat training. Her abilities are tied to the local gods of Kamikoshi City, meaning they’re less effective outside her hometown.
Is Seiko actually a fake medium?
Not at all. Seiko plays the role of a fake medium on television as part of her public persona, but her spiritual abilities are genuine. Her predictions are always accurate (even when they seem wrong initially), and she’s one of the most powerful exorcists in the series’ world.
What is Seiko’s relationship with Momo?
Seiko is Momo’s grandmother and legal guardian. They have a complicated but deeply loving relationship built on tough love, sarcastic banter, and genuine mutual respect beneath the surface conflict. Seiko raised Momo after her parents were absent, trained her in spiritual techniques from childhood, and continues to support her even when they clash.
Why does Seiko look so young?
The series hasn’t provided a definitive explanation, but fan theories suggest her youthful appearance comes from her spiritual abilities—either from borrowing power from the local gods or from her advanced chi control, slowing the aging process. Whatever the reason, Seiko is completely unbothered by her agelessness and rarely comments on it.
Can Seiko defeat Turbo Granny?
Seiko did defeat Turbo Granny in their first confrontation, trapping her in a mystic barrier and setting her ablaze. However, she couldn’t permanently exorcise Turbo Granny because the spirit had merged with a location-bound entity in the tunnel, making her significantly more powerful within Kamikoshi City’s boundaries. The plan to fully defeat Turbo Granny required luring her outside her territory, where Seiko’s powers would also be weaker—hence involving Momo and Okarun in the fight.
What is Seiko’s bat?
Seiko’s bat is named “Nessie” (in reference to the Loch Ness Monster, which Momo believed as a child was the strongest creature alive). It functions as both a physical weapon and a spiritual tool—the bat’s end contains a pencil that Seiko uses to draw circles for her barrier techniques. The bat is inscribed with “Power of Nessie” and has become one of Seiko’s iconic visual trademarks.
Does Seiko smoke?
Seiko is frequently seen with what appears to be a cigarette in her mouth, though given the series’ tone and her spiritual abilities, it’s ambiguous whether she’s actually smoking tobacco or something else. Either way, it’s a key part of her character design, contributing to her delinquent-meets-cool aesthetic.
Will Seiko appear in the Dandadan anime?
Yes! Seiko appears prominently in Season 1 of the Dandadan anime, debuting in Episode 3. She’s voiced by Nana Mizuki in Japanese (known for roles like Hinata Hyuga from Naruto) and Kari Wahlgren in English. The anime adaptation has faithfully captured her personality and fighting style, and fans have praised both voice performances for bringing the character to life.
Why is Seiko so popular with fans?
Seiko’s popularity stems from multiple factors: her subversion of elderly character tropes, her genuine power and competence, her stylish design, her hilarious personality, and her heartfelt relationships with the younger cast. She’s proof that “cool grandma” is a viable character archetype, and she consistently ranks high in Dandadan popularity polls. For many fans, she’s the best character in a series full of memorable personalities.
Conclusion: The Heart of Dandadan
Seiko Ayase could have been a simple character. She could have been the generic wise mentor who shows up, delivers exposition, and vanishes until the next crisis. She could have been the embarrassing grandma comic relief with no depth. She could have been a one-note joke about looking young while being old.
Instead, Yukinobu Tatsu created something special. Seiko is powerful without being invincible. She’s funny without being stupid. She’s loving without being saccharine. She’s cool without trying to be. She’s a grandmother who defies every expectation about what a grandmother should be while embracing the core of what makes grandmothers wonderful: the fierce, protective, unconditional love they have for their families.
In a series about aliens, ghosts, and the chaos that happens when they collide, Seiko Ayase is the anchor that keeps everything grounded. She’s the reminder that behind every great young hero is someone who believed in them first—someone who trained them, fed them, teased them about their crushes, and stood ready to burn down the world to keep them safe.
And she’ll do it all while looking fabulous, wielding a baseball bat, and chain-smoking her way through the apocalypse.