not 100% sure but i think it might have to do with him being human and them being demihuman. i could be wrong, but i think demihumans level up faster than humans do. but it could also have to do with him having to share his XP with his tamed monsters. either reason is possible.
oooh right, his friends are demihumans. i feel bad that he levels up slower than the rest since he mostly does the work too. but i'm still rooting for him to become powerful.
It's also a fact that he's the only one that can use magic. Maybe his leveling up method is supposed to be in another way.
that would be interesting!
that could be a possibility as well. maybe something a more physical quests like they do in guilds? but i think that's a bit too much for his level right now.
why is he the only one who is slow in leveling up while the others are leveling up faster than him. is it cuz he relies on his tamed pets too much?