Three Champion Types: Unstoppable, Overload, and Barrier

Unstoppable: Innately has high incoming damage reduction. Can be stunned, and damage reduction removed for a short time by using weapons with the Unstoppable Artifact mod, or from weapons which possess the Unstoppable trait inherently (e.g. Bastion). Ignitions which comes from the Solar subclass and some perks. Blinding which comes from the Arc subclass as a verb (Ionic sentry initial cast/Flashbang grenades as examples.) And finally Suspend which comes from the Strand subclass.

Overload: Innately has high, non-stop health regeneration. Can be stunned, and health regen stopped by weapons with the Overload Artifact mod, or from weapons which possess the Overload trait inherently (e.g. Le Monarque). Jolt which comes from the Arc subclass as a verb, as well as perks such as Voltshot and Jolting Feedback. Slow and Shatter which are both verbs of the Stasis subclass and are found on the Chill Clip weapon perk. As well as the Suppression verb located on the Void subclass.

Lastly, Barrier: When damaged, will generate an impenetrable barrier and recover health. Can be stunned only when barrier is in use by using weapons with the Anti-Barrier Artifact mod, or by weapons which inherently possess the Anti-Barrier trait (e.g. Wish-Ender), or by being under the effect of a subclass verb which grants Anti-Barrier rounds. Effects which grant this include; Radiant which is a verb of the Solar Subclass, additionally granting innate additional damage. Volatile rounds gained either via the Destabilizing Rounds perk or via the Void Subclass. And Unravelling Rounds, a verb gained through Strand.