Sirus

Sirus is an unknown-gendered creature(unknown if it is a car, Fume, or animal)who is the leader of Sirus's Hideout and the main antagonist in the series. Sirus has had multiple apprentices, whom it teaches and instructs, some of those being Holly and Molly.

The Entrance
Sirus is first seen when Holly is talking to him about something. He/she is not shown.

Soul Training
At the end of the episode Sirus appears standing over Alfredo.

Trips of Danger
Sirus fights Alfredo, and eventually knocks him to the ground, before Alfredo gets another chance and scars him/her down his/her arm. Sirus is later mentioned when Holly tells Molly that Sirus told her to kill her.

Escape from Marleanue Forest
Sirus appears when The Hole Brothers appear, asking to be recruited to his/her hideout as to get a chance to destroy the cars.

Get Ready for Destruction
Sirus appears in Sirus's Hideout when Alfredo and Holly are fighting each other. Sirus nearly tries to kill Alfredo, but realizes that he's one of the only leads it has, and instead sents a Hole Brother after him.

An Escape and an Explorer
Sirus appears when the guard shows Sophia to it, and Sirus later discovers that Sophia is trying to find Alex, so Sirus shoos her away.

The Journey for Alex
Sirus interrogates Pullen several times, trying to speak with Sophia. After Sophia escapes, Sirus takes the blade to execute Pullen, and briefly chases him across the castle rooftops.