If Adrien somehow wasn't chosen, who would you like to see as a black cat holder?
Oh dear, that is a very tricky question! Honestly, I don't think there is a character I want to see as the Black Cat holder specifically, but there are some that I think would be nice options and interesting to follow!
I guess you mean the canon setting and not my AU? Because I would be tempted to pick an adult - for the unlimited use of Cataclysm and because, come on, a teen would need the presence of an adult while she's constantly fighting villains!! - buuuuut... seeing how adults are in the show, I have some doubts! xD
So I willingly choose to take asides the tropes "Adults are useless". And here is the list of characters I think would be nice for the Black Cat if Adrien couldn't become Chat Noir:
Tom Dupain-Cheng, I know it might surprise some, but it could suit him. If you take how protective he is towards his daughter, he would be a suitable BC holder and accept to go in the front line while Ladybug figures out her lucky charm or just keep her from harm.
Penny Rolling, she's very reliable and takes her job(s) seriously. She would rock her role and outfit (haha, sorry). Also, she's very well-organised, seems to adapt quickly, and is good at following someone else's directions whilst being strategic.
Alya Césaire, she was pretty good with the Ladybug Miraculous, but I think she'd be better with the Black Cat. But it's mostly a gut feeling and taking her stubbornness and brashness into account.
Alix Kubdel, while I have mixed feelings about Bunnix's role and powers, it does show that Alix can be reliable and wise: you don't want to give Time powers to just anyone! So she could be trusted with the power of Destruction. Also, she'd definitely be a sassy Black Cat and would know how to annoy the villains, it would be fun to watch/read!
Canon but "blank slate" characters
Okay, I admit that this is more a wish list of "I want this background character to get more screen time and development"!
Gisèle (Caline's wife for those who don't know/remember), I just love her design and have a feeling she'd be a good holder for this Miraculous.
Alim Kubdel, not sure why, I mostly like his relationship with his daughter. It would be quite ironic because his job is museum curator XD , but it would also mean he would be careful with this power and not abuse it.
Mireille Caquet, I guess Aurore has her fanbase, so why Mireille wouldn't have one?
