A Guide to Writing Saiki Kusuo in a Relationship as an Aro/Ace Coded Character
First, yes! It's possible!
Starting Point
Saiki's canonical defining trait is that he wants to be left alone; not because he hates people, but because connection and emotional exposure cost him something. Deep down, he's afraid of hurting people.
He is already aro/ace-coded: he is not interested in romance or sex, he finds the concept of love confusing rather than compelling, and his deepest attachments are expressed through protective, self-sacrificial action rather than words or touch.
The Spectrum Matters Here
Aromantic and asexual are their own thing but they are also umbrella terms. Consider where your Saiki sits before you write a single scene. You don't need to label it in the fic, but you should know.
A fully aro Saiki in a QPR (queerplatonic relationship) reads very differently from a demi Saiki who develops something romantic/sexual after bonding with someone.
There's so much more than this, here's some resources:
See Identities on the Aromantic Spectrum
See Identities on the Asexual Spectrum
If you want to keep him close to canon, I go into more detail of where he seems to fall in this post: Is Saiki really aroace?
It just explains that he's asexual, possibly aegoromantic, potentially demiromantic.
The Relationship Exists on His Terms
Saiki doesn't pursue. He tolerates, then allows, then quietly chooses. A relationship with him looks less like courtship and more like someone being gradually un-excluded from his personal space. He will not confess. He will not ask, but he stops pretending he doesn't care.
He'd stopped trying to lose them after the third time. Whether that counted as choosing them, he hadn't decided.
Love Through Action, not Words
Saiki's affection is expressed in what he does, never what he says. He memorizes schedules so he can intercept problems before they happen. He uses his powers on someone's behalf and tells them it was a coincidence. He shows up. These are his "I care about you."
Choosing to sit near someone even when he could sit alone.
Deflecting a bad situation before his partner notices.
Remembering small details (he'd learn everything without saying a word) and quietly adjusting the world around them.
Physical Intimacy
Asexual doesn't mean touch-averse, though Saiki specifically has reasons to be (his superstrength and psychometry).
This is where a lot of in-fighting happens (please don't invalidate anyone's experience), specifically the favorability.
There are asexuals that don't experience attraction, but feel fine performing the act, or don't care either way, or feel completely repulsed. Same with aromantics.
Write with his physical comfort in mind. He'd likely never kiss on the lips as a greeting. And there are ways around that. Kissing anywhere but the lips can also be very intimate. It doesn't even have to be a kiss; it can be touching foreheads or just hugging.
What He Gets from the Relationship
He needs to realize he doesn't have to be alone. A relationship isn't about romance or passion for him; it's about having someone who knows him, doesn't demand he perform "normalcy".
Avoid:
Having him suddenly "realize" he loves them in a rush of feeling
A partner "fixing" his disinterest in romance
Writing his aro/ace traits as coldness or damage
Grand confessions or jealousy
Sex/romance as a catalyst for his character growth
Sexual descriptions in HIS pov
Treating a QPR as lesser than a "real" relationship
Try:
Slow, quiet moments of acknowledgment
His partner learning to read his non-verbal language
Actual communication replacing assumed romance
His internal monologue being introspective, not tortured
The relationship having its own shape, not fitting a template
Describe him being flustered for being accepted the way he is
When something surprises him, he files it, examines it from a distance, and usually concludes it is "not worth addressing." His internal monologue around the relationship should feel the same.
Feelings, in the conventional sense, seemed like a tremendous waste of energy. Whatever this is, the specific irritation of missing their voice at lunch, as opposed to the general irritation of everything.
His voice is not cold. It is precise. There is a difference. He notices things with care; he simply doesn't emote about them.
Types of Attraction
Explore the other attractions. Saiki actually shows aesthetic attraction canonically. He has (nonsexually) said things like Teruhashi is pretty, Rifuta is cute, and commented on some men being handsome. He, for his own reasons, like average looking people.
*I want to add here that a squish is exactly what Saiki wants from Satou. He doesn't have a romantic crush on him or is sexually attracted to his average looks. He has the platonic equivalent of a romantic crush [squish] on Satou. He wants a deep friendship with him.
What makes a QPR distinct (if you go this route, aro/ace)
A queerplatonic relationship sits outside the romantic/friendship binary. It has the commitment of a romantic partnership without necessarily including romantic attraction, platonic. For Saiki, he might, after enough time, be unable to imagine his life without a specific person in it even if he doesn't want them that way.
QPRs often require more explicit conversation than romantic relationships because there's no script. His partner can't assume that a relationship means X. They have to talk terms. The negotiation looks different for each relationship. Cohabitating and not being alone could be the goal. Or going on "dates" without making it into something; best friends go out together, it's like that.
The partner's characterization is just as important as Saiki's. They need to:
Not need him to perform romance in order to feel loved
Understand that his care is real even when it's quiet
Have their own needs and communicate them; he can listen, even if he doesn't always respond as expected
Not "fix" him, but grow alongside him
The best personalities for this kind of fic are ones who are themselves a little unusual; someone who finds conventional romance overhyped, who values stability and presence over declaration, or who simply fell into caring about him before they understood how he works.
If you don't want to go the QPR route, my recommendation is the demi route because it works really well for slow-burn stories. The gray route can be interesting depending on what the condition is. But please understand, QPRs are just as interactively rich; just look at his friendship with Aiura, it's beautiful. Also, you guys are sleeping on Mera; Saiki has a good relationship with her because they are somewhat the same and she doesn't want anything from him.
And let's not forget, there's nothing wrong with exploring friendship.
Example Fics:
Ichigo Ichie (QPR) x fem OC
-> AO3 -> Wattpad
After college, an aro/ace Saiki unexpectedly finds out he's a father and has to decide what he wants to do with that information. It's not as crazy as it sounds.
Your Psychic Prince (ASpec variety) x genderneutral Reader
-> AO3 -> Wattpad
This is a variety of oneshots. He is a bit different in each one, but it's not outright stated what he is.
Color in the Noise (No Romance/ technically a squish) x genderneutral reader
-> AO3 -> Wattpad
Saiki takes interest in the mind of someone with synesthesia.
Crush Culture is Ψ Overrated (Aro/Ace, no relationship)
-> AO3
Saiki's complicated thoughts on romance and attraction and how the girls view him.
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Hopefully this was helpful. Anything I should add?
Edited to include types of attraction and example fics.








