Uncle Ugo, perhaps Luca’s strangest and most bizarre relative, emerges from the deepest part of the ocean to help Daniela and Lorenzo convince Luca of the dangers of the surface. Like Luca, Ugo once wondered about the world beyond the surface. But following a near-death encounter he learned to steer clear, relocating to his deep-water home where it’s pitch dark, bitterly cold and far, far away from the scary humans above the sea—just the way he likes it.
In his sea monster form, Ugo resembles a humanoid anglerfish as he has a glowing blue antenna and glowing blue eyes. He also seems to be wearing tan moss shorts.
He is also the second character to be voiced by Baron Cohen in an animated movie, the first being King Julien from the Madagascar trilogy.
he is also the fourth character in a family film to be played by Baron Cohen after King Julien in the Madagascar trilogy, Inspector Gustave Dasté in Hugo, and Time in Alice Though the Looking Glass, as Baron Cohen is more known for staring more adult-oriented productions
At one point the movie, Ugo says that there is too much oxygen where Luca and his parents live. In real-life, fish who live in the deep sea, like Anglerfish, cannot survive in low-pressure water.
It's unknown is he's older or younger than Lorenzo.