This depends on how suddenly it happened. If she was all cool Alexiel cool Alexiel for a while, and then one day SUDDENLY SETCHAN, it would probably be OH GOD WHAT?! and then WHY?! and then he wouldn't know what to do with himself because he hasn't thought too hard on Setsuna being in Aather at all, never mind as a hot chick. Personal jesus =/= hot girl, nope.
He... has a general idea that there is a Setsuna/Alexiel connection because wingfruit memory, but he's nnnnnnnot entirely clear what that even IS, so something that blatant would just be the weirdest disconnect ever for him. Mmmmost of Katou's memories are Setsuna-centric, and if it finally clicked that Setsuna IS Alexiel, she'd inherit SO MANY FEELINGS. Less complicated than the Kiracifer ones in some ways because the history there is different and there is less of a, mmmm, sexual/romantic twist there. But Katou definitely has Feelings for Setsuna, and Carnelian would end up +1 Turquoise stalker. It wouldn't even matter that a) Alexiel can take better care of herself than he could, or b) she isn't ENTIRELY Setsuna, either. It's just that Setsuna's important, she's part Setsuna, and unless shown otherwise, it's less complicated having Feelings for HER than it is for Kiracifer.
....Of course, this is hypothetical and subject to change depending on how things are going at the time should said sudden Setchan-ing happen.
Side note: If he figures out Alexiel = Setchan and she starts ACTING LIKE HIM, she's going to gain that nickname.
Is Mukuro really going to go hide in Katou's brain? I FOR ONE THINK THIS IS AN EXCELLENT IDEA, but I'm curious!
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He... has a general idea that there is a Setsuna/Alexiel connection because wingfruit memory, but he's nnnnnnnot entirely clear what that even IS, so something that blatant would just be the weirdest disconnect ever for him. Mmmmost of Katou's memories are Setsuna-centric, and if it finally clicked that Setsuna IS Alexiel, she'd inherit SO MANY FEELINGS. Less complicated than the Kiracifer ones in some ways because the history there is different and there is less of a, mmmm, sexual/romantic twist there. But Katou definitely has Feelings for Setsuna, and Carnelian would end up +1 Turquoise stalker. It wouldn't even matter that a) Alexiel can take better care of herself than he could, or b) she isn't ENTIRELY Setsuna, either. It's just that Setsuna's important, she's part Setsuna, and unless shown otherwise, it's less complicated having Feelings for HER than it is for Kiracifer.
....Of course, this is hypothetical and subject to change depending on how things are going at the time should said sudden Setchan-ing happen.
Side note: If he figures out Alexiel = Setchan and she starts ACTING LIKE HIM, she's going to gain that nickname.
Is Mukuro really going to go hide in Katou's brain? I FOR ONE THINK THIS IS AN EXCELLENT IDEA, but I'm curious!