One of the bishops on the black side is:
ALEX KRYCEK

Some characters don't find themselves on the "dark" side of this game because they are evil, or the enemy. Many of the sleuths nemesis are natural phenomenon.

Alex Krycek does not fall into this category. He is a treacherous, back stabbing, ruthless, double agent.

As the right hand man of C.G.B. Spender, (The smoking man) and having only one arm, (thus connecting him to the arm whaling great mutato) he is the perfect choice for bishop on this side.

The blackness oozing from his facial orifices are from the episode "Apocrypha" and the missing arm stems from "Teama"