Hydro is an Aquos Moonian brawler.
Hydro is somewhat happy boy. He seems to have a good brawling style. He first focuses on shutting down he's opponent attacks and/or defense and than attacks. He's good friend is Winx. They are really tight and talks about stuff like school,places, etc. His Guardian Bakugan is Aquos Contestir and his secondary is Aquos Megarus.