I swear I adore Obey Me and it's characters, but I hate how little information the devs give us about the Devildom/other realms, like, I'd like to know what a standard demon ethic is, maybe a bit about the law too, what other magical items exist even if they aren't necessary for the plot, how strong could a demon/angel get, more about the different cultures of both angels and demons (more than sweets/food that is, there's gotta be more, c'mon), maybe a map about the Devildom, it'd be nice to know how far things are from each other and not have to guess.
I sometimes wish that Obey Me had an encyclopedia or something to know this little details about how the different worlds function, perhaps including it in-game as a new feature would be nice. This could also give the MC a deeper understanding of what they've gotten into, because I can't believe they even went to the past without knowing at least basic history (more than the Celestial war, it is known that demons and angels had beef waaaaay before that).