I think he should have a character sheet and that only Page could control him. That way he'll remain consistent. But if we're still making him at this time then we can come up with something before Page's post if it's alright.
So, I think that he should be a really tall guy around Edwyn's age. I'm thinking that his main pokemon should be attack-focused, like a fighting type. A Timburr, perhaps. It's strong, brutal, and on top of that uses a weapon in fights. Doesn't seem jerkier than that to me. A Croagunk is a good idea, too.
And remember, we need to build his character, too. We're trying to make him a terrible human being, not necessarily an idiot nor a weakling. We could even have it so that he wupps all our butts until later. To be fair, socially it's 4 against 1.