See also: Reverse (phenomenon).
They all have a striking mutual feature in their artwork, they all hold the black rings, this is to signify their corruption by Link Joker. Also, the letter Я has a distinct red outline that all the other characters do not have. So far, they are the only non-Link Joker units to be able to lock.
"Яeverse" units locks their own rear-guards to gain huge advantages, and unlike Link Joker, they can't unlock the units that they have locked.