Afraid of cats. Hates cats. Hates his brother Dream, guardian of positivity. Self proclaimed King of negativity. Ability to form tendrils out of his back. Feels no pain through his tendrils. Immortal. Leads a team called "The Bad Sanses", the members being Horror Sans, Killer Sans and Dust Sans. Fights against positivity and "The Star Sanses", which are Dream Sans, Swap Sans and Ink Sans.