Story of Joining the TeamEdit
During Lock, Shock, and Barrel's mission in Monster High,the trio have been pranking everyone of the students. Gill was frozen solid inside the pool with Lagoona Blue by them. But the only one they haven't pranked was Jackson Jekyll, because of how Manny Taur bulllied him and how he only gets invited to parties because he and Holt share the same body. So the trio began to persuade Jackson to join the team and become friends. After Jackson accepted, music was turned on from the school party and Jackson turned to Holt Hyde. Holt then ratted the trio out and the students began to surround them. But right when everyone was going punish the trio, Heartless, Nobodies and the Unversed were about to attack Draculaura and Ghoulia Yelps. But before they did, the trio moved the ghouls and took the fall, and the students saw the trio fighting the REAL enemies. Lock took down the Heartless, Shock took down the Nobodies, and Barrel took down the Unversed, and as the battle ended, Draculaura and Ghoulia were thankful to the trio for saving them. But when Lock, Shock, and Barrel fainted, the students nursed them back to health. As the trio woke up in the nurses office, they were confused of why Frankie and the ghouls nursed them back to help, and as the students explained, they were all forgiven and the trio explained about the Heartless, Nobodies, other worlds, and Master Xehanort, the students were shocked about their world about to be consumed in darkness. Then after Sora, Kairi, and Riku came in the nurses office from the Gummi Ship to bring the trio back to the ship, the entire Monster High student body asked to join. Just when they asked, Lock, Shock, and Barrel asked also, and said that they'd be big help, and just as Sora, Kairi, and Riku disgused it, they all agreed and the students joined the team.
In Monster HighEdit
Gil is laid-back and sensitive. Out of all of the jocks, Gil seems to be the most considerate, as seen when he tried to help Frankie Stein hook up Slow-Moe and Ghoulia Yelps. He also avoided his love interest Lagoona Blue out of fear of hurting her feelings. It is shown in "Escape From Skull Shores", that when he is scared, he lowers his head into his tank. He is frightened easily but due to his good nature, has the capacity to be stronger than he may first appear.
Gil has light blue skin (or scales) and spiky fins potruding from his neck, forearms and legs. He has one big fin on the top of head that is styled like a mohawk, and flips over to one side.
Gil's parents are mentioned in "Road to Monster Mashionals". Gil tells Lagoona that his parents don't approve of him dating a salt water-dwelling girl. He was stated as the son of the River Monster in the Skull Shores doll assortment. As shown in "Defending Your Lagoona" His parents are partially shown they seem to have tentacles.
Gil appears to be friends with Slow-Moe, Heath Burns and Deuce Gorgon, so it is likely he would be friend with Clawd Wolf as well.
Gil and Lagoona like each other a lot, and would date if it weren't for the interference of Gil's parents. In "Hatch Me If You Can", Gil is paired with Lagoona for an assignment, teaching the teenagers how to take care of a baby by using an egg. They take care of their egg, but when they're graded, the egg hatches and reveals a gargoyle. Gil comments that theirs was the only one to hatch, indicating they were good parents.
Later in "Don't Cheer the Reaper", Gil avoids Lagoona until she confronts him. He regretfully tells Lagoona that his parents don't want him hanging around her anymore because she's from the sea. He apologizes and leaves her in tears. Sometime between "Queen of the Scammed" and "HooDoo You Like?" he lies to Lagoona and says his parents are okay with the relationship so as not to hurt her feelings. They hold hands in "Fear Pressure" after they both win an award on the swim team.
When Lagoona finds out Gil lied, she encourages him to be true to himself, and in "Desperate Hours" he tells his parents that they were wrong about seafolk, tells Lagoona that they will date whether or not his parents approve. In "Miss Infearmation", Lagoona asks if he'll be around during the summer and they jokingly embrace on another. Lagoona nicknames Gil 'freshy' and Gil calls her 'salty'.
In both "Hyde and Shriek" and "Nefera Again" Lagoona comments that she hasn't seen Gil all summer, with the other ghouls reassuring her that he must just be busy. However, in "Back-to-Ghoul", it is revealed that Gil was actually sent away to another school by his parents, just as he had said they would do. Gil comes back to Monster High in "Here Comes Treble", and he and Lagoona resume their relationship.
It is unknown exactly which River Monster he is a descendent but the most prominent is the Kelpie, a demonic water horse that is said the haunt the rivers of Europe. They are known to attract people, sometimes even going under the guise of a beautiful woman, to then lure them into a river and drown or eat them.
More possible parents include Jenny Greenteeth, an English River Hag, the Nix, shapeshifting River spirits, the Merrow, the freshwater equivalent of a mermaid in Irish mythology, the Rusalka, Succubus-like mermaids from Russian tales, or White River Monster or Hudson River Monster.
On the TeamEdit
Gil is a fast swimmer and a teaches members of doing water stealth. On mission's like Lagoona, he goes on worlds mostly in underwater missions. The member he gets along with better are Ariel, Sora, Donald Duck, and Jem.