|accuser (n., adj.)|
Accuser flag by mogaiboards on tumblr
An accuser is a headmate that is similar to a persecutor but is focused almost solely on framing a member of the system (usually a host) as a terrible person guilty of crimes. This is done by telling their other headmates or people outside the system.
This behavior isn't necessarily out of hatred, but may be out of internalized fear or guilt. An accuser may form out of a system's trauma and self-loathing. Like a persecutor, an accuser may be able to learn to overcome this behavior.