Ancient warrior

The Dolphin Warrior is the last of a race of most likely dolphins that ruled over the ocean before the Bikini Bottomites. His race was all killed except for him because of a volcano that also plagued modern day Bikini Bottom in Sponge-Cano and survived because he sacrificed the most miserable man's house. In Sponge-Cano, he was trying to tell the people to sacrifice the most miserable man's house but someone interrupted him before he could say "house." Later, when Squidward's house was lodged in the volcano, he continued what he was going to say, flew off on his broom and hasn't been seen again since.

The Dolphin Warrior is possibly immortal or has a regenerative ability that makes him seem immortal. He said that he and his race reigned over the oceans "before the dawn of time" and he looks young today.

He seems very insane, possibly because he has had no one to talk to for thousands and thousands of years.