Hehe, I bet you your voice is perfectly fine. Young boys with really deep voices crack me up. In a good way mind you. I'm sure your voice is just fine. In my opinion, voices always match the person. :3
Yeah, Yveltall is my favorite of the two. I actually really like the water and fire starters. I'm not sure what to make of the grass one. I can't wait to see their evos later though! :D