Jelonzo is a blue jellyfish who owns Jelly Fresh, a clothing store in Inkopolis, and the only known jellyfish able to communicate with Inklings.
Jelonzo is the charismatic clerk that runs the clothing shop. With his uncanny sense for the hottest trends, he is viewed as a fashion god of sorts by all the young squids in town. He hails from distant waters and has a strange way of speaking that can make it difficult to understand him, but that may be one of the secrets to his success. Aside from his awkward grammar, he also is known to say "BLUUH" from time to time. This may be common to jellyfish (as an onomatopoeia referencing their squishiness), or it could simply be another of Jelonzo's quirks.
Separating Jelonzo from the common jellyfish is his skin color: while other jellyfish have blue-green skin, Jelonzo's is a pure blue with a purple tinge in some areas. It also seems to glows slightly, which has been confirmed by Callie; she often mistakes him for a "glowing ghost", as seen in one of her comments on Bluefin Depot. Other jellyfish may also have this ability, as all jellyfish in Inkopolis Plaza give off a very faint green glow during a Splatfest.