Chuluun is a lean snow leopard with blue eyes, light lavender fur, darker spots, and lighter underside. Her head features a diamond marking with two smaller markings on either side. Under her eyes are two violet colored streaks.
Her shoulders show various markings, some diamond shaped with smaller markings inside. Her tail is tipped with grey-lavender fur with white color just underneath.
Chuluun has been described as a cunning snow leopard. Using her natural abilities as a snow leopard, she can make other animals believe she is truly a ghost, and she sees this as self-amusement or as a defense mechanism.
After her defeat by Bunga, she grows resentful of the Lion Guard and joins Makucha in his quest for vengeance.
By her admission, she doesn't respect the Circle of Life and does whatever she wants, including scaring and harassing other animals for her entertainment.
Her strength is unmatched against Makucha and Ora because it was not enough to handle well against the Night Pride, though she would have more of an advantage if she uses her camouflage against them from the snow as she was thinking of giving up against fighting both the Lion Guard and Night Pride.
When Domog tells the Lion Guard about the tale of the "Ghost of the Mountain" that terrorized the red pandas and forced them from their homes, they believe that Sonnesen Kuhn can stop the ghost so the Guard agreed to help too.
Far away from the bamboo forest and surviving from falling icicles, Anga spots the mysterious ghost they can't catch to which she explains that the creature she spotted was not a real ghost but a leopard, which Ono explains that the creature Anga spotted was a snow leopard, a cat whose fur helps blend in with the snow and camouflage within the environment. As the Guard follows the snow leopard's footprints to which she finally reveals and introduces herself as Chuluun. Kion urges her to stop scaring the red pandas in their home, but she finds it all fun and explains that she does not follow the Circle of Life, but rather follows her own rules and she tells the Guard that she plans to punish the red pandas for daring to challenge her.
Despite Bunga's attempts to stop her (the paint on him given by the red pandas wears off due to him fighting Chuluun), she escapes. Anga spots her scaring the red pandas in the bamboo forest as the Lion Guard plans to stop her from terrorizing their home anymore. Chuluun retreats, still believing she is invisible. Bunga tells the red pandas that, since they can now see the Ghost, they no longer have to fear her.
Bunga leads the red pandas and the rest of the Lion Guard arrives at the mountain where Chuluun is lurking as Bunga tells the red pandas to surround her while he takes on Chuluun himself. However, Chuluun quickly covers herself with snow, cleaning her coat and turning invisible, scaring the red pandas again. When Bunga uses his stench ability, Chuluun immediately falls off the ledge as the red pandas cheer for Bunga's victory.
Meanwhile, after getting defeated by Bunga (although Domog thinks Chuluun is gone forever), she is revealed to have survived her encounter against Bunga and was approached by she was approached by Makucha, who asked her to join him, which she accepted happily his offer to take revenge on the Guard.
Chuluun, Makucha, and Ora are almost at the Tree of Life. Before entering, though, they start arguing as she and Ora are unwilling to take orders from Makucha, who insists that they follow him since he is the leader of the group. Soon after, Makucha's Army is making its way through the pass, eventually engaging the Night Pride in combat. They get beaten by the Night Pride and Rani tells them to leave and never return. Outside the pass, Makucha mocks Chuluun on her plan to attack the Night Pride at night. Fed up with both of them, Ora suggests doing things the dragon way: going in fast and biting everything they see.
Back at the pass, Makucha's Army engages the Night Pride again. When Ora orders the others to follow his plan, Makucha disobeys him, taking an alternate path into the Tree of Life through a forest. Soon after, the predators run into a dead end and are cornered by the Night Pride. During the fight that follows, the predators spread apart, with each member using their own strategy against the Night Pride. As a result, Makucha fights Rani and Nirmala directly, Chuluun sneaks up on Surak, and Ora tries to bite Baliyo. Ora soon paralyzes him with his venom, leaving three members on each group. Kion rushes over as he holds the flower with his teeth, arriving just in time to save Baliyo from Chuluun. Kion's presence rattles the predators, with Ora quickly turning and running away in fear of getting hit with the Roar again.
Noting that Kion came down the hill, Chuluun figures the Tree of Life must be on the other side of it. Realizing this, the predators abandon the attack and start heading for the hill, leaving Kion with the Night Pride. However, Kion reaches the top of the hill moments before Makucha does, surprising the leopard and knocking him over the hill while Rani does the same with Chuluun. Kion and Rani quickly compliment each other before turning back to the predators. The leopards prepare to fight against the Guard as Bunga was able to use his stench ability to defeat them. Later outside the pass, complains about their defeat and that they need to get rid of the Guard especially Bunga, then they meet Mama Binturong who also wants revenge on Bunga and declaring herself as their new leader.
Mama Binturong comes up with a plan to trick the Night Pride. She, along with Makucha and Ora, all approach the Tree of Life while Mama Binturong is keeping the Night Pride busy with a fake emergency elsewhere. However, they get stopped by the Lion guard.
Makucha's Army attacks Varya and her cubs. Mama Binturong orders Chuluun to go after the cubs before they reach to Tree of Life. Inside the pass, she abandons the chase when she was faced both the Night Pride and the Lion Guard team up to stop them. Then after being told to do so, Chuluun leaves Varya's cubs alone and went back to fight Varya but Baliyo headbutts her, then she retreats.
Makucha's Army tempts to attack the Tree of Life at sunrise. However, with help from the Lion Guard, Makucha's Army leaves. Later they all start to think about giving up completely until Mama Binturong gathers Smun's Prickle, Makucha's Leap, and Ora's Bank.
Makucha's Army tries to attack the Tree of Life once again. Chuluun and her friends get blown far away from the Tree of Life by one of Kion's twisters.
Chuluun means Stone in Mongolian.
Chuluun is the first animal to join Makucha's Army.
An early design for Chuluun showed her appearing more like a regular leopard.
She is the only endangered species to not live at the Tree of Life.
Chuluun is only shown camouflaging herself in her debut episode despite having the capability to do so in subsequent episodes when fighting the Night Pride at the Tree of Life.
Chuluun, along with Ora and the crocodiles, are the only villains to not receive a villain song.
Chuluun's voice actor also voices Lumba-Lumba's singing voice.