As the supreme ruler of the vast underwater kingdom of the Psymonster World, Oceanquake is the master of the seas in the Psymonster World. Her authoritative power is her absolute control of the waves, tides, and undersea earthquakes, and woe to any Psymonster who dares to irritate her. Fortunately, she is easily appeased by singular treats from the Psymonster World, and any fruits left in just the right tide pool will ordinarily ensure a quiet, smooth, and tranquil ocean voyage. Any Psymonster just makes sure it is the acceptable kind of gift. Oceanquake doesn't take kindly to any Psymonsters who drop litter into her deep blue domain, and she has been known to summon tempestuous tsunamis and whirlpools if she is having a bad day, or even just a mild headache. It might sound like an overreaction, but any Psymonster tries using this power all of the time and sees how calm any Psymonster feel.
She is a large green octopus with golden yellow eyes, sharp teeth, red lips, and blue spots.
- She is very similar to the Giant Octopus from 1955 American black-and-white science fiction giant monster film from Columbia Pictures, It Came Beneath the Sea.
- Oceanquake is one of the 44 Psymonsters who have no legs (the other 43 are Planto, Zoidburger, Gingersnap, Sundrift, Catfish, Colossus, Putty, Snakegrowth, Mystical, Waxcandle, Angler, Robotical, Sheloden, Kennywheel, Sprout, Scary, Thunderquake, Cobracious, Creaturous, Greedy, Queasy, Transparent, Watermelody, Aquamarvelous, Trampedo, Waxcleaner, Lunar, Snowmelter, Drivacuum, Slash, Stumpback, Elasmountain, Concordian, Conqueror, Puffy, Schizophobia, Tester, Mytherian, Booter, Telephone, Extraordinarium, Bargeria, and Coolberry).
- Like Oceandrinker, Oceanquake has "Ocean" in her name.
- Like Thunderquake, Oceanquake has "Quake" in her name.