We have so many little girls in the game it would be cool if we can get a teenage kid that isn't a girl, he could be an ADC or a Jungler that uses a Slingshot like that character Usopp from One Piece and has a pet maybe a wolf, tiger or a monkey. His Ultimate should be some magical ammo where he shoots in a straight line and explodes dealing damage and confusing enemies.
His Voice Actor could be Finn from Adventure Time. please Riot
EDDIT: I know you guys are saying Ekko and Ez but they are an exception mostly Ez since he doesn't look like a teenager he looks more like a young adult and seems to know his ways already he just looks like hes already seen a lot.