You're pride post is nice, but Senkus just a headcanon so why add him?
Simply put: Because just like Ryusui is canonically bisexual without using the word bisexual, and just like Francois is canonically non-binary (or intersex! given no one is able to tell) without using the word non-binary (or intersex!), Senkū is also AroAce without using the word AroAce :)
For proof regard this post that collected all AroAce Senku moments (contains spoilers, so, careful!!). And also the Manga ending and the specials were very, very clear about it (again, spoilers!!)
But here's a condensed version with a few panels:
Hope that helps! :)

















