Rouge Bengals are a half-breed and use Norn Slot R and Crimson Norns in Grendel Slot Z. But you can still use the Chichi Wingies in Norn Slot R at the same time.
The genetics, and colored sprites were created by Silvak. And are currently being re-done. Whether the other body parts are just going to be added or a version 2.0 of the breed, has yet to be decided. More info to come.