Rocky does not often express either amity or hostility to his fellow contestants. However, due to his frequent barfing, many contestants find him disgusting, and therefore harbor (typically unrequited) hostility towards him.
In "Rescission", after dodging the Announcer's shovels, he's killed by the Announcers acid tears.
In "The Glistening", when the Announcer asks who wants to go back to earth, Rocky raises his foot.
In "Return of the Hang Glider", when the Announcer reveals that he sold Dream Island, Rocky screams.
Rocky and Balloony are shown to be close friends as Balloony seems to like his "salt and vinegar".
In "Getting Teardrop to Talk", when Balloony says "So many meanings!" towards their team name, Rocky makes a noise in agreement.
In "Don't Dig Straight Down", Rocky eats Nickel when Balloony tells him to. However, when Balloony asks him to help break into Golf Ball's Underground Factory, Rocky appears saddened but does nothing.
In "Don't Dig Straight Down", which is their first direct interaction, Cloudy asks Rocky if it's nice to be short (due to Balloony getting killed by the lava because he was the tallest) and Rocky makes a sound in agreement.
Status: Enemies, on Coiny’s side
In "Fortunate Ben", Rocky barfs on David to wake him up.
In "Crybaby!", Rocky vomits on Firey during the handstand contest.
In "Lofty", Rocky barfs on Firey, who then remarks that Rocky has serious vomiting issues.
In "Don't Pierce My Flesh", Rocky vomits on the Firey Speaker Box, making Firey slap him.
Status: Friends, on his side
Firey Speaker Box
In "Insectophobe's Nightmare 3", Rocky eats one of Fries' poisoned fries and dies.
In "Are You Smarter Than a Snowball?", Rocky is sad because Golf Ball gets mad at him for not doing his test.
In "Cycle of Life", when it's Golf Ball's turn to carry Rocky, Rocky barfs on her face and causes her to crash into a tree.
In "Get in the Van", Rocky agrees to never switch from Golf Ball's team.
Status: Possibly friends
In "Cycle of Life", he just happens to vomit on the slice on the wheel that Ice Cube was on.
In "Reveal Novum", Rocky barfs on Ice Cube, causing her to blink.
Status: Minor enemies
In "Return of the Hang Glider", when asked who he'd like to win, Rocky vomits Leafy's shape.
In "Getting Teardrop to Talk", he seems to be happy to join Leafy's team; he later vomits in her face.
In "Lick Your Way to Freedom", according to Leafy's chart, Rocky is the most loyal to her.
In "Get to the Top in 500 Steps", Rocky is the only Beep contestant who doesn't back away from Leafy when she rejoins; Balloony pulls him away instead.
In "Lick Your Way to Freedom", Nickel points out how Rocky doesn't have a job yet.
In "Don't Dig Straight Down", Rocky eats Nickel in order to barf more acid.
Rocky and Pencil seem to have an ongoing conflict throughout the episodes.
In "Vomitaco", he's pushed into the giant barf bag when Pencil throws a bowling ball at him.
In "Reveal Novum", Rocky attempts to make Pencil lose the staring contest by vomiting in her face. Pencil ends up winning by throwing his vomit into his face.
In "Rescission", Rocky asks Pencil if she's glad that he didn't vomit on her, marking the first time he's spoken since BFDI 1. When Pencil asks if it feels weird to talk after going so long being silent, Rocky vomits on her.
In "Return of the Hang Glider", when Rocky's infinite matter generator is destroyed, Pencil says "Finally, no more vomit", Rocky responds by barfing a spike in her face.
In "The Long-lost Yoyle City", Pencil kicks Rocky into a fish's mouth causing his death.
In "Get Digging", Rocky backs away when Pin asks if anyone wants to switch to their team.
In "Get in the Van", Rocky jumps over a knife that Pin threw.
Status: Minor enemies
Rocky and Puffball have never really interacted with each other. Their closest interactions are when Rocky gets on top of Puffball so she can fly the team to the summit of Yoyle Mountain. Rocky might be enemies with her as he is frowning when Puffball starts to shrink and makes him fall.
Status: Possible enemies
In "Bridge Crossing", he's thrown into a gorge by Snowball where he presumably drowned.
In "Power of Three", Rocky spends the entire challenge being carried by Snowball.
In "Reveal Novum", they both vote for Leafy to be eliminated.
In "The Glistening", Rocky helps the others push Spongy into the ship to be used as fuel.
- Main article: Rocky and Tennis Ball
In "This Episode Is About Basketball", Rocky vomits on Woody and later cheers when Woody manages to get a ball in the basket.
In "Insectophobe's Nightmare", Rocky causes their team to place second by vomiting in front of their path, causing them to slip.
In "Crybaby!", he causes the team to get stuck in a large snowball when they hit him during the skiing contest. He later vomits on the team during the handstand contest.