I have a lot to say, so let me just get started with the first three characters. This is basically everything I have about the game as well.
Eris - A thief who lives in an undead swamp, the only living person to do so. She is, to her knowledge the last living witch in the world, but sets out on a quest to find her family after a voice in a prophetic dream tells her to.
Due to living on her own for her entire life, she's very practically minded and determined. Secretly, however, she wishes for a place in which she belongs, in which she doesn't need to be on guard all the time.
Minnie - A self taught mechanic who scavenges the wasteland for parts to build various gadgets. She was abandoned by her parents and, like Eris had to look out for herself for many years. Unlike Eris, Minnie faced much more competition, as the wastelands had a lot of people living in it with little resources.
She is generally quite timid, but is very proud of her inventions. Any sort of criticism or thought about it in general will get her riled up. She's been without her right arm for as long as she can remember, but has a robotic substitute in its place, which has different modules she can equip.
Youchi - A rock elemental boy from a warrior tribe who is a few years younger to Eris and Minnie. He's the runt of the litter of his tribe and is often the target of ridicule by his tribe. In a fit of teenage rebellion, he decides to leave the tribe in order to help Eris find her family, after they get to know each other.
Youchi has a great deal of issues regarding his temper, he is very quick to anger and can hold grudges for a long time. Despite this, he's also very protective of those dear to him, and even though he doesn't like the tribe members around his age, he still thinks of the tribe as his family and that he needs to protect them when the going gets rough.