This article lists the interactions between Barf Bag and Donut.
Ever since being placed on the same team, Barf Bag has befriended her fellow teammate Donut. The two of them seem to be rather close friends, following each other to Two's The Power of Two series and remaining by each other's side as they make new friends in their new team. Most of their interactions so far have been positive.
Episodes suggesting a friendship
In "Why Would You Do This on a Swingset", Barf Bag is inspired by Donut's speech.
In "Questions Answered", Donut gives his team a question only they would know the answer to. When Barf Bag does get Donut's question right, Donut cheers excitedly.
In "What Do You Think of Roleplay?", Barf Bag is confused as to why Firey Jr. would refer to Donut as mean and justifies Donut's behavior in BFDIA. Claiming that he was sticking to his principles.
In "Don't Dig Straight Down", Donut is horrified when Barf Bag is drained of her barf and scolds his teammates for running around while she's injured. Barf Bag explains to Donut that she needs liquid in inside of her before loosing consciousness. Donut then patches her up and tells Bomby to fill her with warm water. When she becomes conscious, Donut hugs her and she thanks Donut for caring about her. Donut is delighted when she claims she feels amazing, but starts to get annoyed every time she repeats how great she feels. When she realizes the water in the lake is way too warm, she explains to Donut that that shouldn't be possible unless they are around something with a lot of heat. She jokes that they could be near a volcano, which scares Donut, which turns out to be the case. When Donut sacrifices himself for Spongy, she seems upset, and scolds Gelatin when he makes a joke out of it.
In "You Know Those Buttons Don't Do Anything, Right?", Donut says "Well I know I'm sticking with Barf Bag" and forms a team with her. Barf Bag smiles back at Donut as he says this.
In "The Worst Day of Black Hole's Life", Barf Bag seems unimpressed with the challenge as she tells Donut that there's only one way to stack things. Donut says there could be more methods before getting interrupted by Coiny, who suggests that they glue the blocks together. Donut and Barf Bag immediately get to work on following through with Coiny's idea. Later, they both help Coiny lift their stack back up after Eraser knocks it over.
Neutral interactions
In "Getting Teardrop to Talk", Barf Bag deduces that Donut and Naily should join their team by process of elimination, as Gelatin decided they shouldn't pick Pen or David. Donut replies with an annoyed "thanks".
In "Four Goes Too Far", Barf Bag is grossed out when Donut injects the Twinkle of Contagion into himself.
In "This Episode Is About Basketball", when Gelatin is about to suggest that they use Bomby, his team glares at him. Gelatin finishes, saying they could use Bomby to throw balls into the baskets. Donut doesn't believe that Gelatin is over wanting to blow up Bomby and Barf Bag informs Donut that he's taking a step in the right direction.
In "You Know Those Buttons Don't Do Anything, Right?", as the rest of the team argues over what their team name should be, Donut and Barf Bag exchange looks at each other and Barf Bag shrugs.
Episodes suggesting a conflict
In "Questions Answered", Donut asks Barf Bag why isn't she answering for their team in the quiz challenge. Barf Bag apologizes, saying her reflexes are too slow. Donut gets increasingly annoyed when she isn't able to answer what snow plus gasoline is.
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