Note: this is still an experimental W.I.P Welcome to Happy Trails Penitentiary! Yancy is a major character in the CHYOA YouTube adventure series A Heist With Markiplier, either being an antagonist or supporting character depending on the choices the player makes. He is the affable and charismatic inmate of Happy Trails Penitentiary who leads the other inmates of it and helps them have a good time in the prison with him. Greeting the player, he will welcome them to the prison through a song he and the other inmates perform called "I Don't Wanna Be Free" and introduce them to the inmates in an attempt to convince them to stay. Depending on the options the player chooses, he can either become their friend by helping them stay in prison and have a good time, become their enemy and defeat them in a few battles, or start off becoming their enemy before taking their defeat with grace and helping them escape prison and thereby becoming their friend. He is portrayed by Mark Fischbach, better known as Markiplier.

Loona is a hellhound with a wolf-like appearance. She has a pointed, dog-like muzzle with sharp and pointy teeth, and a dark grey nose. Her eyes have red sclera, white irises and slit-like pupils, and she wears grey eyeshadow and black winged-eyeliner for makeup. Her fur is white with grey countershading encircling her face, grey patches on her shoulders, and long, voluminous silver hair swept to the side to reveal her dark grey ears; the left of which is pierced with two small, black hoop-piercings, while the right is ragged. She has a large, dark grey bushy tail with white on the underside. She also has a piercing on her right eyebrow with a black hoop for jewelry.