[quote=@KenjuGuy]
If he was the big guy, it would be ironic since I see Jun as the shortest guy on the team in my head.


And though he is smart in some aspects, he's mostly  the reckless hothead who bets on himself. 

[/quote]

You don't have to literally be big to be the big guy, it's purely metaphorical. Toph was the Big Guy in Avatar, and she was physically the smallest in the group.