[How do you beat Darth Sion?]

lol, i never even used force powers on him. With a good enough saber I got him in about 3 hits each time, a real disappointment.

[Most Memorable KOTOR 2 Moment]

I don't know why, but I liked the ending. The part where Kreia reveals everything and when she says she's proud of the Exile.

[Carth?]

Do you get to see more of Carth in KoTOR2? I have just completed the game as a LS M Guardian but only remebered seeing him once when Disciple reported back to the Republic. I chose the Revan going on the dark side dialogue option though. He became an Admiral it seems.

The only other trace of the Onasi family left that I've found is an "Onasi Blaster".