Gummlee is the slash ship between Prince Gumball and Marshall Lee from the Adventure Time fandom.
Marshall Lee's relationship with Prince Gumball seems to be similar to Marceline and Princess Bubblegum's rivalry toward one another.
When Fionna and Gumball find Marshall Lee on the roof in "Bad Little Boy", they find Marshall was the one who had stolen Gumball's cream puffs. Marshall proceeds to drink the pink color out of a cream puff, then toss it at Gumball's head. When the puff hits him, Gumball's response is to grimace and begin climbing down from the roof, telling Fionna he is going inside and she can come with him if she would like "more polite company." It is unknown what happened to him after Fionna and Marshall Lee ditched him to go to a party.
It is presumable that they have a strong dislike for one another similar to that of Marceline and Princess Bubblegum. Though in the graphic novel, they seem to be fine with each other when creating the magical wand stick for Fionna. It also shows in the novel that when Marshall Lee takes his leave, he tells Fionna, "Tell Gumball I said bye," showing that he cares in a way.
Due to the relationship between Marceline and Princess Bubblegum improving since season 7, Prince Gumball and Marshall's relationship concurrently improves, as well.
However, the episode "Five Short Tables" revealed that Marshall Lee is a regret of Prince Gumball, so their relationship is left ambiguous from the standpoint of the show. However, considering it is genderswapped Bubbline, and Bubbline is canonical, confirmed by the creator, it is safe to assume that they are canon.
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Gumlee is one of the most popular ships in the fandom. It's a genderbend of the Bubbline ship.
- It's confirmed by the creator that Marshall Lee and Prince Gumball were dating at one point.
- Bubbline refers to the ship between Princess Bubblegum and Marceline Abadeer