Ax-Crazy: According to Ventrinio, you were a definite case of this.
"You never talked about yourself, but you were... you were terrifying, okay? You were the coldest, most terrifying thing I've ever met! You wouldn't have threatened me like this — you would have just stabbed me to death and looted my corpse. Seriously, I saw you do that to people! Often!"
Came Back Strong: Whoever, or whatever the Fateless One was prior to his/her death and subsequent revival, there is no question that he/she is more powerful now.
Deadpan Snarker: About half of the Fateless One's responses on the dialogue wheel are this. "Sorry I broke your fate rock," indeed. The other half (aside from Persuasion checks and requests for more info) are consummately tactful, moving conversation along and deftly changing the subject away from anything that might antagonize or embarrass the other person.
Fighter, Mage, Thief: The Might, Sorcery, and Finesse trees, respectively. The Fateless One, however, as the Player Character, is free to choose which one he/she wants, allowing her to mix and match whatever is desired.
From Nobody to Nightmare: Towards the Tuatha. Originally a successful experiment on mortal resurrection which they tried to kill, the Fateless One became the single greatest threat to their cause, and, eventually, defeated them and their god.
On a smaller scale, towards Tyr Magnus of the House of Valor. A nameless fighter who just so happened to pass by the House of Valor and win a fight. Again. And Again. And then best the assassin that was meant to kill him/her...
Heroic Mime: We never really hear the Fateless One speak.
Spanner in the Works: Big Bad Tirnoch revived him/her with the intent of using the Fateless One to release her from her prison as part of her Gambit Roulette. The would've worked too, if the Fateless One wasn't so much of a Badass.
Try to Fit That on a Business Card: Starts off as "The Fateless One", but after some gameplay, becomes The Siegebreaker Of Mel Senshir, King/Queen of The House of Ballads, Champion of The House Of Valor, Truesworn of the Warsworn/Forsworn of The Warsworn, The Chariot of The Travelers, The Child of Autumn, The Archsage of the Scholia Arcana. DLC adds The Scion of Akara, Master of Gravehal Keep, Herald of The Gods, etc. Not bad for someone who died prior to the story.
The Magnificent/Red Baron: The Twists of Fate could be seen as such. Notable examples are Siegebreaker, Unstoppable Force, Child of Autumn. DLC adds even more to the list.
Messianic Archetype: To the Fateweavers, who have been exiled and treated like crap, due to foreseeing horrible futures for everyone. Even though a fateless world would be utterly unpredictable and subject to The Evils of Free Will, not to mention they would be rendered obsolete for the most part, the Fateweavers simply don't care. It's gotten that bad in Amalur.
Blessed with Suck: His opinion on the "honor" of being inducted into the Fateweavers. It's pretty hard on a man who's overcome every challenge to then know for years exactly how he'll die, and how unavoidable it is.
Noodle Incident: He alludes to a lot of wild past exploits, from tracking enemies by smell alone to once being "left half-naked and tied to a barghest" by a dark elf.
Hoist by His Own Petard:She is the one behind the Fateless One's rebirth and subsequent freedom from fate, in a Gambit Roulette to free herself. She did not, however, take into account how Badass the Fateless One became when he/she was revived.
Our Dragons Are Different: Possibly a really old Winter Fae with the power to control fate. Regardless, she possesses a very draconic appearance.
God Is Evil: Pretty obvious, considering her followers are the Tuatha Deohn. Not to mention the fact she is the one keeping everyone within Fate's stranglehold.
Walking Spoiler: Revealing anything about her will reveal pretty much everything. Including who the Fateless One was in the first place.
A Fae you encounter in the Travelers sidequest, he is a Fae hunter who's become possessed by the item Buru's Boots to become a psychotic killer.
Anti-Villain: Being subjected to possession by Buru's Boots is the only reason he's really the monster you encounter him as, and originally he was a pretty nice guy
Break Them By Talking: You can ATTEMPT this, but his Persuasion check is so high it would be impossible unless you focused on increasing it from the start, and when you succeed he still slips back into insanity, but you get the necklace A Hunter's Friend, which is actually a pretty good item for characters focusing on stealth.
Dual Wielding: He wields a pair of Faeblades
Fallen Hero: He was originally a Fae from the House of Ballads, who was a legendary hunter until he got possessed
Get Back Here Boss: Every time he loses a certain amount of health he'll escape to another room of Arduath, where the fight takes place
High Pressure Blood: Every attack he does that manages to hit causes a large amount of bleeding damage
Malevolent Mutilation: What he intends to do to you.