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

An avenger is a type of protector system member 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.