Welp changing names is easy, changing the battle UI and making it different for each character, now that's something I had never tried in RPG Maker and been kinda avoiding, but I guess I should try it out at this point.
You bring a lot of interesting ideas and suggestions on the graphics and base mechanics, definitely will think about, try to implement and test them. For now here's a rough initial draft of the customized battle HUD that changes between characters: 
Thanks once more, that was a big help!