I think a kinda neat and apt representation of the sort of thing I do with my legacy characters is what the Archer series has been doing the past few seasons. They take the same core characters and tweak them to fit into fun new settings. It's a lot of fun to figure out how you could fit a character into an entirely new setting! The characters are the same people at their core but the setting specific parts of them have changed. It's also a really effective writing exercise and I quite enjoy it. Like, who wouldn't enjoy the challenge of turning a velociraptor trainer from a Jurassic World RP into the alpha of a pack of lycans?

I could understand why some people might not like that or it just doesn't work for them, but I think it's kind of ridiculous to act like there's an objective 'right' or 'wrong' way to create, play, or develop a character. In my opinion, that attitude shows a sort of rigidity that'll impede a writer in the long run.