omg yes i'm so passionate about this topic
Rechargeable has always been really entwined with the readers because i started developing the concept for each character + the plot publicly on tumblr. it's because of their questions + involvement that the world building process was so detailed! naturally a lot of people felt really involved with it and making OCs was another way of expanding on their own ideas and fitting them into my world
the working name for rechargeable was "batteryverse", so reader-made OCs are called BVOCs! and there is a HUGE COMMUNITY of them!! this was more active before my comic's hiatus, but there are still plenty of readers around today who have BVOCs and develop them into real three dimensional characters.
i love it so much - it makes the world feel even bigger, made me develop details about the world and the story that i wouldn't have considered before, thus opening up new plot opportunities! and of course i took as many opportunities as possible to include BVOCs into the pages themselves. a few readers who became close friends have even gotten their characters made canon into the characters' epilogues
some OC features:
edit: my fave part about BVOCs is that even though rechargerable is about gangs (and there ARE plenty of gangs - some that people have made up themselves, and others where readers have joined together to make actual groups :D), a lot of BVOCs are like... cafe owners, or dog washers, or hairdressers. they just want characters that experience this universe, so having all these Regular People with interesting stories again just makes it feel so fleshed out <3 and ofc that means i've always got people to turn to when i'm drawing scenes in these settings!