Telekinetic exsanguination is by far the best ability in any game, followed closely by the room-clearing Cadaverous Lacerations and Eviscerate Corpse moves from Defiance.
Since I played SR1, then BO, then SR2, BO2, and then Defiance, my perceptions of Kain were rather coloured during BO. The best part for me was going along with Raziel's hatred of kain, really buying into the idea that he was the bad guy, and then having to rethink the whole situation along with Raziel as he learned the truth.
Kain is the star of the show, so naturally I have to choose him as the best character. Nobody, not even Ash from Evil dead, nor any character ever played by Johnny Depp, has ever had such magnificent-bastard quality dialogue.
Defiance wrote:Kain peers down into the silent Spirit Forge, smiles as he spots Moebius, and floats down. Moebius is speaking to the Elder God, although he cannot see it, and he unaware of Kain landing behind him.
Moebius:
...the Hylden are merely an inconvenient consequence. They will be dealt with in time.
Kain quietly draws the Blood Reaver.
Moebius:
It's a small price to pay for Kain's death.
Kain:
You're a bit premature.
Moebius whirls, aghast.
Moebius:
Kain!?
Kain:
Is there a crack in your omniscience after all, Moebius?
Moebius repeatedly activates his staff, with no effect.
Kain: (amused)
First your omniscience, and now your powers. You're slipping badly.
Moebius:
This is not possible...
Kain strikes the staff from Moebius's hand and seizes him by the arm. He holds Moebius's palm against the hole in his chest.
Kain:
The part of me that staff affected is no longer in its place. But you already knew that, didn't you.
Kain pushes Moebius away roughly.
Kain:
I always was considered heartless. And now, Moebius, it is time.
Moebius:
To kill me? Again? Your only solution, for every problem: kill.
Kain:
This is not a debate. You see, this time, you have nothing that I want.
Kain seizes Moebius again, this time impaling him on the Reaver.
Moebius: (struggling to speak)
You think this will matter? I serve One who has power over life and death.
Kain:
Then go to him.
Kain pushes Moebius off the blade. The Time Streamer falls, and lies dying on the floor.
I love how he toys with Mobius when he knows he poses no risk, and then ends it so bluntly and unceremoniously, as though he were scraping something from his boot.