Megalo is a giant shark from One Piece who serves as a mount and companion to Princess Shirahoshi of Fish-Man Island. He appears as part of the royal household’s protection and is often seen carrying Shirahoshi through the underwater environment. Though not a human character, Megalo plays a small but memorable support role in the Fish-Man Island arc, helping establish the scale and atmosphere of the setting while assisting in Shirahoshi’s movements and safety.