<Gil[]
- Gil has had the most appearances as a main character (followed by Molly).
- Gil is the only guppy to appear in every pop song.
- Gil is the only one out of the guppies who screams.
- Gil is often the target of the jokes in his and Molly's sketches, usually being chased away by an animal or the Little Fish and sometimes is gullible for doing anything else. Gil just has bad luck (sometimes).
- Gil's favorite color is purple. As revealed in The Crayon Prix!
- Gil's Favorite Food Is Pizza As Revealed In Happy Clam Day!
- Gil's Favorite Drink Is Apple Juice As Revealed In Happy Clam Day!
- Gil may have feelings for Molly.
- Gil's best friends are Molly and Goby.
- Gil's lunch box is the same color pattern on his tail, but it is blue instead of green.
- Gil has done a lunch joke, he has done 16 lunch jokes so far. He has done one in Call a Clambulance!, The New Guppy!, Snow Squad to the Rescue!, Something Fishy Going On! Race to the Oasis, Taste Buddies!, Werewolves of Bubbledon!, A Giant Harvest Day!, The Holiday Pirates!, The SS Friendship!, A Big Splash!, Bubble Medics to the Rescue!, Search for the Great Silverback!, Don't Yuck My Yum!, The Fastest Feather in the Race! & The Big Rig Bandit!
- Gil is the only guppy with a one-syllable name (despite the two-syllable name Molly calls him, "Gilly").
- Gil is ticklish.
- Gil (along with Molly and Bubble Puppy) is often used to represent the show on merchandise and other things.
- Gil is named after the gills of a fish.
- In Super Shrimptennial Celebration, during one of the sketches Molly is the target instead of Gil.
- In Happy Holidays, Mr. Grumpfish!, it is revealed that he loves cookies.
- It is revealed in Happy Clam Day! that Gil is afraid of bees, however this is never addressed again. In the episode, "Bring on the Bugs!", he got over his phobia.
- In The Grumpfish Special!, Gil was the only one who wasn't wearing a chef's outfit. He was however, wearing one during the pop song in Super Shrimptennial Celebration
- Gil's favorite book is "Secret Agent Stories" in Check It Out!.
- He don’t have his singing voice in Season 1 and 4.
- Gil's US voice actor, Zachary Gordon, is the star of the first three Diary of a Wimpy Kid movies, as Greg Heffley.
- For some reason, Gil's name is "Phil" in the European French Dub .
- His voice in the UK dub is Hayden Hunter who would later voice Chase from PAW Patrol in the UK dub, but Hunter makes Chase sound older.
- In A Tooth on the Looth! it is revealed that Gil's toothbrush is purple.
- In Check It Out!, it is revealed that Gil carries a toy car and a crayon in his backpack.
- in Season 1, in Bubble Puppy!, Gil adopts a puppy of the same name.
- Whenever something happens to Bubble Puppy, Gil would become worrisome, due to the fact that Bubble Puppy is Gil's pet.
- Gil's favorite ocean animal is a stingray, as seen in The New Guppy.
- Gil narrated 6 story segements in the episodes The Spring Chicken Is Coming!, The Amusement Parking Lot!, Gobble Gobble Guppies!, The Running of the Bullfrogs!, Too Bright for Movie Night! and See You Later Alligator!, except Season 2 and 4.
- Gil and his family are possibly from New York (or whatever the underwater counterpart is). He sings with a New York accent in the backpack song and wears a B&W suit and fedora in a city skyline background in Rock Your Style!
- His Theme is Daisy's Season 20 Theme from Thomas and Friends in a step lower in pitch.