from what i interpret is that each character has their own characteristic and seeing that they create their own persona just means that each class si different and as far as we know that everything came from a game yet have their own background story. So probably the reason why the MC is op because he made him op. Knowing classes just from watching and creating a skill itself.
yeah, i’d also like to add that mc’s character is not exactly op. in the beginning it was mentioned that the demon hunter type was considered useless before since there were no demon type monsters but since demon types suddenly started emerging and him being the only demon hunter left (i guess, i’m not really sure about this fact.) he is op for this type of circumstances. and the character he created is pretty smart i’d say, figuring out all that turning things into other things stuff lol.
ngl i don't rlly understand the power system here, like how is it possible for the mc to create such an op character without other also just basically doing the same, BUT i love the mc character and his avatar ig, the way his thoughts being interpreted so differently and confuses everyone and make him died inside out of embarassment is just so funny