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Skull is cynical and straight to the point, most of the time doing the talking and sarcastic remarks for Hex even if at her own expense. He is also lazy and reckless, sometimes interfering in their schoolwork, and boastful of his own abilities. However, his ego actually hides a fear of being alone and separated from Hex's social life, causing him to take even more impulsive actions if their friendship appears threatened.
Skull is constantly surrounded by a spherical force field, which appears to protect him from most threats and support the weight of a Skylander - though the same cannot be said about good balance on top of the sphere. He is capable of levitation while inside the forcefield, and Hex can use telekinesis to make him tackle enemies and magical tethers to slow him down.
Over the years, he has also learned various spells from his sorceress, and use them with ease. If removed from the forcefield through one of these spells, Skull is slow and his only means of defense are the spells, as he has to hop his way to any destination.
Before his appearance in the Skylander Games, Hex chose him from various skeletons to create a familiar bond, with the side effect of also binding the dark side of her supernatural energies.
In the series premiere, Skull was summoned by Hex to assist her during the Skylander Games, but the trial left both of them exhausted. Because of their performance, Hex and Skull failed the Skylander Games and had to study for another year at Skylander Academy. Skull then ranted to Hex that they lost to Bad Breath, whose only ability was burping.
In the cold open of Anger Mismanagement Hex and Skull are in a counseling session with Hugo about his refusal to work as a familiar. However, Hugo is threatened by sheep halfway through and flees without finishing the session. Later, during the Chilli Chomp Competition, he is part of Ka-Boom's team despite his inability to eat.
In Beard Science, Skull accompanies his sorceress in a class with Master Eon, and after the headmaster accidentally makes the cadets think Roller Brawl's uniqueness is in her balancing, he gets used in a human pyramid, much to his dismay. When Master Eon passes them later, without his beard, only Hex has a vague recollection of him, but Skull dismisses her concerns and they get distracted into other activities to discover their unique appeal.
In Assault on Skylander Academy, Skull is used as weaponry against the Doom Raiders' failed infiltration, knocking Dreamcatcher away as they escape. However, when he and Roller Brawl attempt to stop Kaos' attack on the school by diving into him, they are defeated by his empowered dark magic spheres.
They are polar opposites, and because of his rebellious and cynical personality, their teamwork suffers greatly. However, despite directing harsh words to anyone including her, they still like each other and don't shy away from hugs and kisses in emotional moments.
Roller Brawl and Wind-Up
Though he doesn't share their enthusiasm for most classes, he follows them along with Hex through their misguided ideas.
- Skull is based on Hex's skulls in her Series 2 figure artwork and figure, with slightly different coloring.
- Though he can't eat, he pretends to eat the chilli in the Chilli Chomp Competition in Anger Mismanagement, and ends up incapacitated despite only having it touch his forcefield.
- Skull's spells are phrases with the words in reverse, unlike the gibberish spells used by Kaossandra and Eon, and Strykore's entire chants in reverse. The spells are:
- Now is time to say peace out and nice to know you, sayonara, ciao, and aloha!
- Please forgive my grave mistake, a friend who didn't give but would always take.