As a kid, I used to watch an afternoon cartoon called "Marine Boy," (it was "anime" but we didn't call it that at the time). I was entranced by the idea of living underwater, (Marine Boy chewed "oxygum" to breath). Marine Boy threw a boomerang as a weapon, which could simultaneously explode half a dozen submarines into huge fireballs, (underwater fireballs - a la "anime" again). What a great show that was!
What is this kid's name?
The Hair works great underwater. (Marine Boy wore a cheesy helmut.)