Tbh with dance killer you could have it that when he first starts dancing again it isn’t break dancing because of the fact that 1: he’s not used to it anymore, he hasn’t danced like that for years
2: it like showing how he’s healing and having hints of who he used to be come back but also he is irreversibly changed as a person at the same time
I think dancing isn't something Dance monsters can lose, it's as much a form of magic as it's an actual skill. And while not using that skill for a long time makes it harder to get back into it later it doesn't erase it. Killer's relationship to it might be changed forever but his ability to isn't.
I don't really understand why people are trying so hard to get rid of the breakdancing man I think it's cool ^^ I get wanting something that fits Killer's sort of aloof, elegant? Demeanor though. He could have something like waltz like Dance!tale Chara does (from the Dreemurrs) or Ballet like Frisk/the player, as a second style (Dance monsters can learn secondary styles though they have an innate main one). Probably in his time with Chara and Nightmare (omg me making not a nicemare thing?) it would act as a part of his conditioning, the erasure of his original style and having it replaced with Chara's. Kinda like the hc people have that Chara taught royal manners to him but like dance lol.
Him recovering his ability to breakdance as a symbol of his emancipation <3
