Nuke

*Supreme Leader Nuke - Nuke was a dark side user who worked for and The Evil Something. He was the Supreme Leader of the Last Order, which was a part of The Evil Something. He did not claim to be a sith lord. He was a High Penguin, and he claimed that he hatched before the Khanzem War. Nuke was killed by Krylo Ben (one of The Four Sith Lords), after he turned good and Nuke tried to stop him from stealing The Evil Something's evil plans. After Nuke's death, the Last Order was disbanded.
Nuke was possibly actually just some random evil force-sensitive High Penguin hired. He definitely didn't hatch before the Khanzem War.