This game is really interesting. I feel that I've played a similar game like this where a the start you can choose 4 classes for different characters but what's different here is that we can change the personalities. I don't know how it affects the game but it is really interesting. The gameplay is nice and not bad in any way. This game is a real fun rpg experience without any plot. Would play it if I want to just see how far I can go in this game and level. :D
Thank you for playing! The personalities work like natures in Pokémon, where certain stats will grow faster and others will go slower depending on which one you have. Sticking with the default or using one that seems appropriate for the class will usually give good results, but I decided not to explain that fully in-game so that new players would let the personality options spark their imagination rather than feeling bogged down trying to make the best choice statistically. The difference isn't very big until high level, anyway.
I encourage you to play further, and offer up any ideas you may have on how to improve it the game!