Gulpo is a giant blue piranha with yellow and red spikes and claws, huge fangs and sharp teeth, small pink fins and big bulging eyes.
His arena takes place inside a surreal cylinder-based tank and he is the boss of Claris Sinclair's Mystic Forest dream. To defeat him you must fly to the nearest fish thats facing directly at Gulpo. You will find your self blasted through the tank and hit Gulpo. Repeat 3-4 times to defeat him. But you must be careful not to be blasted into his mouth. He can also attack by sending purple orbs into the fish around the tank, making them gain a dark purple aura which will hurt NiGHTS on contact.
- Gulpo's theme is "Deap It Lies".