Canyon is a very tall humanoid, roughly the height of Billy. She wears a headband, a lime-green dress, a belt with a blue gem in the center, and brown knee-high boots. She also carries a small, dark-blue strap bag. Canyon has long, dark-cyan hair, light-cyan skin, and a yellow crescent moon on her forehead. Her eyes are green, and her ears are pointy like an elf's. She also has an overbite.
Canyon became friends with Finn while she wanted to finish Billy's bucket list and gave Finn Billy's loin cloth. According to Canyon, Finn reminded her of Billy when he was younger, which might've – along with their shared connection with Billy – been the cause to their friendship. She offered Finn advice whenever they encounter each other as seen in "Mama Said."
She was Billy's girlfriend, but she severed their relationship four years before "Billy's Bucket List." This was because Billy began to lose faith in the good brought on by his heroic acts and believed like that it was no longer worth it.
She mentions that the two were once a "power couple," which is exemplified in her flashbacks of the two riding Billy's motorcycle and slaying monsters with swords.
- Canyon stated that she and Billy broke up four years ago before his death. And while Billy clearly aged, Canyon's appearance has remained the same. This could mean she's either much younger than Billy was or she is possibly a water elemental of sorts; thus ages slower than others. This may be supported by her parting the river water to return home, and her skillful manipulation of her family's sacred spring.