Deep Sea King

The main antagonist in the Sea Monster Arc and the strongest Sea Folk amoungst his people.

Biography
The Deep Sea King orchestrated the invasion on the surface world. Sending his most powerful warriors to the surface to scare and reek havoc amongst the surface dwellers. While most of the invaders were killed by Stinger he was able to best him in a single punch. After a brief fight with Lightning Max he was challenged by Puri Puri Prisoner and Speed-o'-Sound Sonic.

While it seemed he and Puri Puri Prisoner were equal in strength he was infact far stronger. After finding and trying to kill Sonic he grew stronger while in the rain. Slowly gaining the upper hand and even outmatching Sonic. Managing to find the security dome he pummeled even more heroes. He and Genos engaged in a fierce battle the two matching each other blow for blow. It ultimately ended when he spat acid towards a small child and melted the cyborg. About to kill Genos Mumen Rider arrived to stall for time eventually Saitama appeared and killed him in a single blow ending his reign of terror.

Personality
Deep Sea King was extremely cocky and quite polite prior to battle (although a bit rare). During however the battle he was known for slinging insults. He also greatly hated humans often calling them apes.

Abilities
Deep Sea King had the ability to transform when exposed to water. it increased his strength and speed capable of trading blows with Genos.

Speed
While not the fastest being in land form, his sea form was able to match Sonic. Even being able to see through some movements in some cases.

Power
He was able to not only match Puri Puri Prisoner and Genos but he was able to disable both. However it is not known if his sea form was able to best some heroes due to his only fights being off sceen in his sea form.

Durability
Deep Sea King is quite possibly the most formiddable foe as he is able to regenerate. Puri Puri Prisoner despite hurting him was unable to deal significant damage to him. Even Genos punching his cheek so hard it was able to pierce him and bare his teeth was able to regenerate from that. Despite this though he was unable to regenerate the hole in his body.

Trivia

 * Deep Sea King was the first Demon Level to fight and beat multiple heroes.
 * Deep Sea King is referenced by Puri Puri Prisoner in episode 12.