Kallor's already high on your list, but...
OK, first thing we hear about him is that he conquered a continent in fifty years, and then three Elder Gods decide to stop him with curses. Result?
K'rul? Rendered completely powerless for millenia.
Draconus? On a chain gang for millenia.
Nightchill? Kallor was feeling gallant, so she just got ripped apart.
Three Elder Gods decide to fuck him up, and Kallor comes off best.
So he wanders around for a while, and earns such a rep for badassery that even when he walks into a court full of people who hate his guts and puts down his weapon, nobody messes with him. Is such a military genius that Caladan Brood keeps him around even though everyone in his camp absolutely hates him.
Silverfox is a mystery to everyone. Everyone is concerned about her potential, what she will/will not do. Kallor recognises her nature
instantly.
Quick Ben is one of the most mysterious characters in the series. Kallor figures out that he has multiple souls before anyone else, and makes it clear that he could easily break those chains if he chose. Quick Ben immediately flees. The guy who takes on dragons and Icarium.
He has not faced defeat in combat in one hundred thousand years. Caladan Brood names four people in the entire world who might possibly alter that record. He serves as a very able military adviser to Caladan Brood, even though
he doesn't even care whether they win or lose. He is on the staff of one of the most powerful ascendants in the world, because he has nothing better to do.
When we finally see him fight, he takes down Korlat, two elite marines, and Whiskeyjack, all in the time it takes Tayschrenn to react. Whiskeyjack almost cut him, but the only reason that opening was there was because Kallor's heel caught in something at the wrong time. Whiskeyjack didn't outfight Kallor. He was blindly lucky that Kallor was coincidentally left exposed.
He happens across the Dying God, and the Dying God doesn't even try to stop him. Kallor concludes that the whole cult isn't worth his time and keeps walking.
So Kallor leaves, and Korlat and Orfantal vow revenge. Except that they're so scared of him that they take five books to catch up even though they are dragons and he's just walking. When they do catch up, Kallor kills Orfantal... and keeps walking.
Rake doesn't want Kallor to get Darujhistan. He sends his best man, Spinnock Durav, a Tiste who fought his way out of Assail (the continent that is chewing up T'lan Imass like scarecrows). Spinnock does well enough to reduce Korlat to tears, slowing Kallor down slightly.
And he does all this without being an Ascendant. He's a mortal with some skills in alchemy and a couple of curses.
Edit: Can't believe I forgot this. Eight high mages destroy a continent to kill him. Meaning A) The didn't dare face him directly, and
he survived a God being thrown at him.
Before he was cursed with longevity
This post has been edited by the broken: 28 March 2012 - 11:10 PM