Aquaman
Abilities and resources
Spoiler :
On land, limited superspeed and leaping ability
Moderate superstrength (talking class 50 at least) to propel a body at those speeds underwater
Durability to survive the cavitation forces.
Bullet proof durability
Water breathing obviously
Nightvision/extrasensory perception
Cold resistance
Lord of Atlantis
Access to the entire resources/population of Atlanteans
High end technology, arcane magics, and he is a King Arthur.
Capacity to talk to fish
Affect fish descended portions of higher life forms (psychic powers on autonomic functions)
Pull out the stops and call out Lovecraftian horrors, Kaiju, and mythological marine monsters as has been shown to exist canonically in the DCU ocean.
Basically, just taking what's there and tweaking it a bit to it's logical conclusion, turning him into a pretty beastly guy. Also, as shown in comics, whale's can move islands at his beck and call.
http://atopfourthwall.blogspot.com/2012/11/brave-and-bold-54.html