Well, he's mostly a boy who's a very sore loser so he often resorts to cheating to get ahead. He's the type who's like "Is only cheating if you get caught, mate!" and he also has a bit of an ego and thinks most people are beneath him (protip: they aren't).

All in all, if it means he's coming out of a situation as the winner, he's down for all sorts of underhanded tactics. Not sure what Oswald is up to in Genessia, in the regard of tricking folks, but if he needs a sidekick that will rarely question his morals on that, Haga is here lol