Huh

So "actor from a fandom that I never watched the show but still read a whole bunch of fic of (and who's character is a popular pairing with the lead) has a band I'd never has listened to on my own but I found through fandom & now I'm enjoying the music of" is a very specific category but now I find I have two people in it.

Gareth David-Lloyd who plays Ianto in Torchwood who has the band Blue Gillespie.
and now Joey Batey who plays Jaskier in the Netflix series The Witcher who has the band The Amazing Devil.

They're also both British, (from Wales & England respectively) and both have dark hair & pale eyes.

Sorry, it just stuck me as a very specific category & now I'm wondering if I'll ever add to it.