>Warrior friend-I understand he's my bro, but what makes him a bro, no real description besides that he's the best bro of all.
That's the trick. Depending on the backstory YOU choose when you start the game, this leaves the Bro's story bland enough to be filled in by your backstory.
>Cat girl- What kinda of village was she from? (jungle, grassland, plateu, etc) What a normal member of the village like, was there any other reason for leaving besides wanderlust?
That will depend on the creators. The jist is that yes, it's plain wanderlust and 'curiosity killed the cat' syndrome that makes her come to your country and join you. Only the creators nkow why, but my money is on her being a deviant who likes human males.
>Pervert mage- How did so much power? natural talent? or just hard practice? did he have a teacher? Etc.
You know the obsession that Japanese NEETs have? That's what he's got. Ever since he was young, he's always wanted to make his perverted fantasies as real as possible, and if that meant spending years of sleepless nights and combing over dead languages, who was he to care? He's got the same one-track mind of brilliance and autistic strangeness that makes TheToadyOne able to create the impossible wonder that is Dwarf Fortress. Seriously, the guy was in 10 different doctorate programs, all because it was his dream to make a game like DF.
>Suave Devil- why of all the suckers in the world would he side with you?
Because he's a Devil, and that means that, like all celestial types, he can see the Destiny of your soul/timeline. He'll use you to get back at one of your eventual opponents, and then decide there whether or not to backstab you.