I'm not a fan of Viktor being asexual because that reinforces a lot of stereotypes about this community.
Apparently the co-creator of Arcane said that Viktor is asexual right after the show ended and people started shipping jayvik... Sorry but it looks weird!! Are you trying to stop people from shipping these characters? Because it won't stop!
You know, disabled people, people with autism and people with mental illness are often portrayed as asexual because they think they're incapable of falling in love or that they don't deserve to be loved. Furthermore, with disabled people reinforce the idea that they aren't desirable. People can't imagine the idea of them having sex, enjoying intimacy.
Sex education condemned that with Isaac's character!!
I mean sure, it's okay to headcanon Viktor as asexual (more if you are asexual, we need more ace representation), but I don't think the co-creator of the show is doing that in good faith. I'm pretty sure he doesn't know that asexual people can fall in love, have a partner and even had sex (obviously depends on the person).
Also, sure make the guy in your show dealing with no feeling emotions and become some kind of machine the ace representation of your show, how original! Never seen before!!