From Pluralpedia, the collaborative plurality dictionary
non-traumagenic (adj.)
Applies tosystems, headmates
Origininverse of traumagenic

Non-trauamagenic is an umbrella term inclusive of all plural identities that are not formed from trauma, or traumagenic. It could be considered a synonym for endogenic.

Some systems may use trauma-related terms but identify as Non-Traumagenic or be mostly traumagenic with some Non-Traumagenic headmates. It is up to the individual(s) if they consider themselves partly or wholly non-traumagenic.

Some examples of Non-Traumagenic plurality can include tulpamancy, spirigenic, and kingenic systems.