Rainbow

Rainbow was a Hippocampus who befriended Tyson in The Sea of Monsters.He appeared at the beginning of the quest and took Percy,Annabeth,and Tyson to the Princess Andromeda.He followed them to the Sea of Monsters and rescued Tyson from CSS Birmingham when it sank.He took Tyson to Polyphemus' Island.Shortly after he rescued Percy and his companions when the Queen Anne's Revengewhen it sank and took them to Miami.After the quest Tyson rides him to Poseidon's forges.