Maybe a bit out of order, but the Kotor comics will shortly start a story arc that turns some people into Dark Siders. Why it's interesting?
This is the first victim to fall to the Dark Side in this arc:
A possible Sion.
And guess what? His best friend/padawan, Lucien Draay
, has lost everything at this point. His position as a Jedi Master, he's accused (rightfully) of murder....and he has a mother called Krynda
. All three Sith Lords could originate from these 3....Sion, Nihilus, Kreia...
PS: They're part of a secret covenant who plans to hunt down all Sith, going as far as killing their own padawans. Sounds Dark Sidish to you?