(Must Be Plot Approved)
Generally any allied race can be breed with humans. Halfbreeds are not common and not usually looked upon with favor, though some are more accepting than others.
It is not possible to have a human-Grehlok half-breed, as they Grehlok gene is predominate, and even if one was birthed half human, the markings and features would be passed down to the offspring, even if only one parent was Grehlok. If you would like to play a half-breed, you must get plot approval for your costuming and idea.
Special Note: Half-breeds do not have any specific costume requirements, however, we encourage some costuming to hint as to what race of half-breed they are. All costuming for half-breeds must be approved by plot to avoid racial confusion.