IT'S CAT AXOLOTL WITH DRAGON WINGS that does witchcraft.. I'm trying to include all of your preferences, @moomoo-08, so here's my try at a long backstory lol ima name it tinker or something
Tinker was always the weird axolotl- She took interest in different land and sky animals like cats and birds and bats. So Tinker decided she wanted to be all of those things..With her amazing regenerative power that came with being an axolotl, it could help her achieve her dream. She soon went insane. After that, she figured out how to do magic somehow. Tinker mixed in her regenerative power and a little magic power to make herself regenerate parts of her body she never had like wings and cat ears. Lots of time had passed and she soon considered herself perfect- then sought out more power. This drove Tinker even more insane and she became extremely powerful. The end lol