Aquamarvelous is an adventurous and spiritual Psymonster who spends her time frolicking beneath the waves, but she has a special calling: she is determined to become one of the most outstanding and excellent Psymonsters to ever swim all the way around the Psymonster World. Aquamarvelous has set out to circumnavigate the Psymonster World by sea and to see all of the impressive sights along the way. So far, she has seen bridges, boats, lighthouses, and lagoons someplace in the Psymonster World. She has gone swimming with other Psymonsters, and once even went on an expedition with an empathetic group of friendly Psymonsters. The only thing that Aquamarvelous regrets about her trip is that she hasn't been able to find an underwater mailbox to send all of her postcards home.
She is a big beautiful mermaid with tan skin, blue eyes, red lips, blonde hair, a gold crown, a purple seashell bra, and a teal-green mermaid tail.
- Aquamarvelous is a portmanteau from the words "aquamarine" and "marvelous".
- Aquamarvelous 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, Trampedo, Waxcleaner, Oceanquake, Lunar, Snowmelter, Drivacuum, Slash, Stumpback, Elasmountain, Concordian, Conqueror, Puffy, Schizophobia, Tester, Mytherian, Booter, Telephone, Extraordinarium, Bargeria, and Coolberry).