Thank you again for the advice!
After reading and making some considerations I think I'll take all advice as you suggested, with the exception of Gura. The reason is due to the
skills she gains a little later in game (next update for you that started with Ame) or earlier if you start with Gura.
I started the game as some sort just "shitposting", with skills being just memes and the game being easy, just a bunch references to have some little fun. That being said, like you, many people find the game fun but "could be funnier if it was a little more challenging"
So yeah, now I'm in that process of making a silly game into a more serious game, gameplay-wise.