One of my first characters ever, Blaze! She's evolved over the years, but her main theme and the thing that stuck with all her derivatives is dimension-hopping. She is an ageless being with a couple of lackeys that she goes on adventures with (very doctor who-ish, specifically David Tennant's era). There were a bunch of very angsty things going on, her skin is a porcelain shell containing a demon, so that if she gets damaged or stressed the demon will take over, and she'll go feral. I made her when I was 12.
I got a lot better at naming characters over the years, her derivatives had names like Alice Faber, Ellowyn Parks. The latest version was Ailani Liu, and she was a scientist feeding into corporate greed to further her field of study before being torn apart across dimensions, and the demon within were the nanobots attempting to re-construct her.
I'm not a huge fan of the story any more, I used it for my senior design project, and it went poorly in a way that was completely out of my control, so I have negative associations with it. But the transformation of this character into her subsequent iterations is fun to look back on. Especially in relation to different characters from her 'generation'
this character (Ailani), has a version that dated a version of this character (Dallas)
A fact made only funnier by the fact that these are their current iterations love interests: