The Dolphin Warrior is the last of a race of highly likely dolphins that ruled over the ocean before the Bikini Bottomites.
He is a light gray dolphin. He wears a dark green loincloth with a light green leaf design, and has a dark red crown and a light blue necklace. He also uses a staff that is a bamboo stick with a coral attached to the end of it.
He is most likely a messenger to warn Bikini Bottomites about volcanic eruptions and how to avoid them. His race was all killed except for him because of a volcano that also plagued modern day Bikini Bottom in the episode "Sponge-Cano!" and survived because he sacrificed the most miserable man's house.
He appears when everyone gets to the shelter, he is trying to tell the people to sacrifice the house of Squidward but someone interrupts him before he is able to finish saying "house." Later, when Squidward's house is lodged into the volcano, he continues what he was going to say, then flies off on his broom and is never seen again.
"No hoho, you didn't let me finish." -
"A sacrifice of the most miserable person's house!" - Explaining to the crowd how they are to sacrifice a house not a person.
"A sacrifice of the most miserable person... (interrupted by the bottomites)."
As opposed to his species (and the whole dolphin family plus the cetacean order), he is never seen resurfacing to breathe.
He is, however, a warrior, so he may never need to resurface to breathe.
He is the first animated dolphin to appear in an episode, as others were real like in "Jellyfish Jam."