Emperor Abyss is the main antagonist of The Kingdom of Meralore
Emperor Abyss started his reign by turning all the seaweed black and animate, imprisoning most of the mermaids and sea creatures and letting the seaweed grow to building wrapping-lengths. Emperor Abyss wasn't satisfied with ruling one kingdom, however. He wanted to conquer the rest of the oceans. Emperor Abyss then encountered Squiddy, who came up to him disguised as a piece of coral. Squiddy told him that he is only scratching the surface (or scraping the waters in mermaid slang) and that he needed to look above the water to find more interesting things. Abyss decided to swim up to the above world and found Umi City, realizing that there are humans, buildings bigger then what he has seen, and the entire city is, as Squiddy told him "dry".
With a malicious smile, Abyss used a dark spell to submerge Umi City to make it fit for his ever expanding kingdom, forcing all the citizens (except Team Umizoomi) to either escape the city in boats or climb to the highest buildings as the only source of dry land. Once most of the roads were submerged, he was able to swim to new places he had never been. Squiddy caught up to Abyss, telling him stories of The Blue Mermaid (Azure), his desire to be a ninja, and La Perla de Madaline. The latter caught Abyss' interest, so he asked Squiddy to lead him to the pearl, which is in the Umi City Museum.
When both he and Squiddy made it to the museum, he sees three familiar mermaids in a water-filled tank along with a forth one that has a glowing tail, and three unfamiliar creatures whom Squiddy calls "Team Umizoomi". One of the Team's members, Milli, is holding up the pearl. Abyss realizes it is "The Pearl of the Light" and learns about how it will be used against him, ending his reign. To prevent the plan of bringing it back to the pedestal, he summoned a dark spell that splits the pearl into three pieces and plans to place each piece into Coral, Finn, and Kai. With the pearl split into pieces and Team Umizoomi disabled, he thinks that he can finally continue his reign.
Abyss has long black hair and dark blue eyes. His tail is midnight blue. Abyss wears sharp gold armor and a golden helmet where his hair pokes out in a ponytail. His chest armor has a black pearl on it.
- Emperor Abyss is the second emperor after Emperor Jacques. Unlike Jacques, Abyss is evil and wants to rule the entire planet.