Right, gonna say some ideas I have planned while I continue working on streamlining the game. 

Idea: The Maou will end up gaining powers kinda like in a videogame, though via customizable specialization rather than established and inflexible classes. Like they can choose to hammer away at something like say... [Farming] and can end up gaining a skill such as [Animal Husbandry] for their hard work. You can then combine several things together like [Magic] plus [Farming] to get a skill like [Instant Plant Growth] and so on. Successfully doing more difficult things in their specializations means they can have access to higher level skills. Also the Maous will have a headstart in skills they're already good from their time on Earth, since that makes sense.