The main cast of Card Players consist of an illegal immigrant, a murderer, a gun-toting 10 year old with an agency out to kill her, and two ex mercenaries (one of which drinks the blood of his victims, while the other Demon eats them) all on a quest to thwart the evil around New York City. It doesn't help that they're dressed like muggers while they do it.
The only Red vs. Blue character with black armor (Tex) is actually on the side of the (more or less) good guys.
From what little we've seen of her, Yang's mom Raven Branwen has an intimidating red and black getup and wears a white mask similar to the Grimm, and also wields a gigantic red nodachi. However, she jumped in to chase off one of Yang's attackers who was about to kill the girl. Subverted later, when Raven leaves a message for Yang saying that her intervention was a one-off "kindness" that Yang shouldn't expect again. Qrow explains that Raven has an unusual outlook on the world and is quite dangerous, despite the two keeping in contact.