Based on the in-game mechanic of critical hits, as well as a gold variant based on the effects of Australium in the comics.

Style 1 includes experimental "Outline" tech, which causes a rimlight and faceglow to appear at close range.
Style 2 removes this experimental tech.

Both styles use Position-on-model, which causes the unusual effect to spawn based on hat size and shape.

Teamcolor - Critical Condition
Australium - Life Support