The SMW kaizo community has several prominent trans contributors and notable members (Shoujo and shovda being probably two of the more public ones, both participating in the relay race at SGDQ 2022, which also had at least two trans creators). I'd include Maddy among the notable member, but that's a relatively recent thing with her release of Super Sonic Saves the World World and Sure Shot (a level of which was in the SGDQ race and was co-created with another amazing member of the community). Unfortunately it wasn't always that way apparently (the SGDQ 2019 relay race did include someone who was later shunned by the community for platforming transphobes apparently).

Also, the kaizo community and Celeste community have a lot of overlap given they're both tough platforming games for lots of community-made content.

Its also just small enough that everyone can know most other people who are part of it.