Megalo

Megalo (メガロ) is a shark that lives on Fishman Island. He is the favorite pet of the Mermaid Princess.

Appearance
He has a usual shark design, the only difference is that he wears a shirt from the Criminal fashion line.

Fishman Island Arc
Megalo was first seen being freed from the Kraken accidentally when Luffy attacks it. Later, he tells King Neptune about the pirates, and the king invites them to Ryugu Palace, apparently as an act of gratitude.

Trivia

 * His name is probably derived from the legendary sea monster/extinct shark species Megalodon.