An entity that lives in backrooms (ex. in the space behind mirrors) they have free will and don't mimick their body holder. There are slight differences between them and mirror
twins. That's because while mirror twins share only body similliarities with their body holders, Chax's share also
soul. It happens that sometimes Chax's and body holders are able to comunnucate (ex.through mirrors). Chax's can also switch places with body holder if they agree to or if their body holder is weak enough can
even posses them. However they're mortal and easy to
kill.
"My Chax just won't leave me alone, she wants to switch places"
"Yeah try avoiding mirrors at all costs, that way you can get rid of her"
"I don't know
maybe I should just let her"
"Have you
gone mad? Backrooms are super dangerous just try talking to her about it and don't switch places with her!!"