The top of his head seems a little weird. I don't know if you would be able to alter that a little bit or not. I will need an intro sprite for him as well.
Allen in this game is like the rival in DP, he's a longtime friend of the hero. Also, to give you a little bit of an idea of how I imagine him--he's somewhat effeminate, and perhaps insecure about his sexuality. This might explain why Allen has a "superpower" Pokemon like Machop; he has to prove he isn't weak!