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Here are a few characters who I interpret as aspec:
Dinadan!!! He is an absolute aroace icon. In a source whose name has slipped my mind, Isolde comments on how he ought to be in a relationship and his reaction is something along the lines of, “Yeah, hard pass. How’s that working out for you, by the way?” (Read it with sarcasm).
Galahad, Bors, and the Grail Heroine all seem quite happy about the eternal chastity thing. None of them have any close calls with demon ladies, unlike poor Percival, the one allo person in the friend group. (Yes, Bors has a son, but a cursed ring was involved there, which is why as much as I do not stand Bors’ Morte misogyny, I will always pity him).
Kay is very rarely ascribed romantic relationships, and in one Welsh source, his father prophesies that Kay’s heart will be “eternally cold”, which could be interpreted as never enflamed by love.
Any others who come to mind?
Just a reminder that if you say anything along the lines of "support the content, not the creator" (there's an actual saying but my 12 am brain can't remembered it) only works if the creator is not making any money off of the content
You can say that about Homer and Greek mythology, bc Homer is dead and all related works are public domain
You can say that about Tolkein and Lewis, bc they're both dead and any products go towards their estate, obviously not the person
You CANNOT say that about JKR, bc she's still very much alive and involved with everything HP related. Even buying a butterbeer at Universal Studios gives her money (I'm not kidding. She gets a cut of anything HP)
You CANNOT say that about Neil Gaiman, bc not only is he alive, but he still makes money on anything he was ever a part of. Yes, he's no longer involved with the production of Good Omens and most companies have cut ties with him, but if you buy a copy of Coraline, or Sandman, or anything he has ever written, he is getting that money
Is that clear?