IT'S A MESS, HONESTLY, there's no good place to jump in except perhaps the phone game since it's made to be as accessible as possible. There's some deep lore shit in the universe the further you dig but tbh you don't need to know even 70% of it to understand the major important stuff, it's fun!

HAHA FUCK. okay like spoilers: he's actually an evil dude who literally has never cared for anyone before but now in this reality and from his canon point he's at a point where he's gotten close to someone and doesn't realize the floodgates it's opened. Do it. Do it, do it, do it. Please.