From Pluralpedia, the collaborative plurality dictionary
avenger (n., adj.)
Applies toheadmates

An avenger is a type of protector headmate that is angrier in nature than other protectors, normally but not always as a result of trauma.

These protectors tend to hold the anger of the system and/or other system members, and lash out at those outside the system, with the intent to protect the system.

These protectors can also be referred to as anger holders.

In systems with type B trauma, an avenger will often seek revenge against the abuser or abusers.