Oddly enough, she has never called Goby by a "pet name".
Deema occasionally waves to the viewers during a montage as a way of breaking the fourth wall. She has waved to the viewers in Can You Dig It? during the excavation, and in X Marks the Spot! when the gang crossed Buccaneer Bridge.
Deema is the only Guppy to normally wear jewelry.
In Happy Clam Day!towards the end of the episode, Deema says, "The suspense is maddening!" This is one of her most famous quotes.
Deema is the first Guppy to have a daydream sequence. This occurs in the end of Tooth on the Looth!when she imagines her visit from the Tooth Fairy.
The top of Deema's hair sort of resembles the preschool that she attends.
Her hair also resembles the hair of another Nickelodeon character, Didi Pickles from Rugrats.
Sometimes, in pictures, Deema's hair is flipped around in the other direction, If you turn your head and look at the picture below so that Deema is right side up, you'll notice that her hair is different.
Since Season 2, whenever a shop segment takes place, Deema sets the shop up by saying "Well, you've certainly come to the right place!"