Hippocampi

The Hippocamp or Hippocampus (plural: Hippocampi) is a mythological creature that Poseidon created to serve him. He appears as a stage hazard in PlayStation All-Stars Battle Royale.

Connection with All-Stars
He appears as a stage hazard in the Rapture stage. He appears in the background along with Poseidon where he breaks the building and causes water to floor in the building, forcing the players to flee from the room. He will stalk the fighters some more until he gets defeated by Flow organisms.

Abilities
The only thing that Hippocampi is seen doing it barging through the glass of the building to let it flood, but further only stuck around with Poseidon and occasionally break through a window.