Ignored Expert: In his backstory, he told his last employer that the tower he was working on would collapse if he cut corners, but the latter insisted on doing things his own way. Then the tower collapsed, killing the employer to boot.
Cultured Badass: He's quite eloquent for a steppe nomad and has high Intelligence when you first recruit him.
Feuding Families: Took up being a mercenary because he sought to continue his family's feud against the Khan's wishes.
Horse Archer: As befitting his heritage, he starts out with high levels in Horse Archery.
Proud Warrior Race Guy: He believes that the Khergits' decision to settle down and tie themselves to cities and the comforts of civilization will make them weak and easy prey for the next wave of conquerors from the steppes.
A would-be horse thief who enjoys plundering innocents.
Christmas Cake: Is a middle aged, unmarried female. She shows interest in Bunduk.
Joke Character: Kinda sorta. The only useful skill she has is "Inventory Management", which is of no use, since she's a follower and not a leader.
The Silverstag mod averts this. It adds several special abilities (granting some passive bonus to the party) to hirable companions. Katrin has one which is calcultaed from her Inventory Management, which makes her automatically resupply the ammunitions of the allied units.
A sociopathic girl who needs to get out of town - fast.
Token Evil Teammate: This wiki article about hirable heroes includes a guide suggesting two companions setup (built accordingly to their mutual like-dislike relations): one for early game, one for latter in the campaign. The early party is especially made of heroes not relucting to raid villages or caravans (which is an easy way to gain money in early parts of a campaign), the second includes more honourable heroes who dislike those actions. Despite her background and not disliking raid actions, she appears in the suggestions of "good" party members.
The Strategist: Notably, he chooses a strategy nearly identical to generally-accepted "best" army composition.
A brilliant merchant.
Intrepid Merchant: He's apparently been all over for trading. He is also the best trader in the game, at first.
Magikarp Power: Starts at level 1 with terrible equipment and mediocre abilities outside of intelligence. If you're willing to invest in him, he can surpass Artimenner or Jeremus as an engineer or a medic
A Nord widow looking to reclaim her rightful lands from her opportunistic brother-in-law.
Action Girl: She's very proficient with a wide array of weapons and has points in Athletics and Power Strike.
Affirmative Action Girl: Calradia is a sexist land, remember? She was basically shafted by her brother-in-law for being a woman, in fact, despite having apparently proven herself to be her husband's equal in all matters.
Battle Couple: With Nizar. She also formed one with her husband in the backstory.
Blood Knight: Face battle with relish and dislikes retreating.
Magikarp Power: Starts at level 1 with terrible equipment and mediocre abilities outside of intelligence. If you're willing to invest in her, she can surpass Artimenner or Jeremus as an engineer or a medic.
Runaway FiancÚ: She's on the run from an arranged marriage with a man she's disgusted by.
Wide-Eyed Idealist: She basically becomes a mercenary to demonstrate she can take care of herself and because it's sounds fun, with hardly a clue as to what that really entails.
Achilles' Heel: Harlaus is a highly competent opponent in battle, but his equipment is heavy and cumbersome. Chances are he will be taken down by an archer/fast melee character or be thrown from his horse and ganged up on by a group of soldiers.
Badass Grandpa: One of oldest monarchs. However, his high level and high tier equipment make him one of the most dangerous.
Fat Bastard: A reputation Harlaus developed due to his tendency to hold feasts at improper times, including when he's under siege.
It's All About Me: If you are allied with Swadia, be prepared to see "King Harlaus has decided to give the fief of [Town/Castle/Village] to King Harlaus" A LOT.
Mighty Glacier: The single hardest opponent to kill in the entire game, he has the best armor possible, a good sword, and shield, luckily, he's a bit of a Stone Wall, since he doesn't have a lance.
Stay in the Kitchen: While all other rulers have logical, if a bit selfish, reasons for denying or not acknowledging a claimant's right to the throne, Harlaus' reason is only that "She is a woman, and would not rule well," and gives no other reasons.