1. no they're not planned to be playable sorry
2. yes ;) and yes to 3 as well.
4. i've had some of these characters for quite a while as something i drew for fun, and i always wanted to make an rpg maker game so one day i saw that a game jam was happening and decided to go for it! treat is my fave so i made up a story about her. then everyone liked the game so much it really motivated me to keep making more haha
thanks for the questions!