Raig

Raig units are Contributor+ exclusive units with many strange (or unique) properties, but most notably loud screams and a meme face. The Raig units are all united under a strange virus called the Viraig, and all of the units appear to be various mutations of the disease.

They are currently only featured in The Zombie's Onslaught (and was previously the main point of April Fool 2017 or otherwise known as DE RAIG Onslaught)

Presence in The Zombie's Onslaught
According to SuperEvilAzmil himself, Raig is not canon. While it appears in Legacy and Overhaul, its staff-only nature backs up its non-canonical appearance.

Since Raig units are exclusive to staff members, newer players can easily fall victim to their many gimmicks that make them very dangerous. Most of them are red with black highlights. In Legacy, there is ~12 different Raig units while Overhaul has 5 (currently). Overhaul's Raig units also have strength in numbers because they all spawn in groups with the exception of ULTRA RAGER.