The Dark Shadow Lord is a villain of the Buddhist Monkey series (a spin-off of Happy Tree Friends).
The Dark Shadow Lord is the master of the Generic Tree Ninjas, whom he usually sends to kill Buddhist Monkey. He will kill any minion who has failed him. In the episode "Three Courses of Death", he sends Char Sui to do the task, though once again, Buddhist Monkey prevails.
The body of the Dark Shadow Lord is hidden in the shadows and, so far, only his red glowing eyes are visible. He has been dabated as possibly being a yak or a dragon. It is possible that the Dark Shadow Lord will return in a future episode to battle Buddhist Monkey himself.