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troperville

Blood from the Mouth When Katja is struck in the face, she spits blood out and informs the BLU Engineer that she 'bit her tongue'. Whether she really did bite her tongue or the Engineer actually caused some major damage is unknown.
Farmer's Daughter Katja is a little different, as she's in medical school and from Germany, but she reveals in Chapter 5 that she grew up on a farm and is an attractive woman.
Feminine Women Can Cook Subverted. Katja is a brash, brazen tomboy.
Friendto All Living Things Katja adopts a dove in Chapter 5, mentions having experience with cows, horses, chickens and cats, though this seems to have more to do with her farm experience.
Multigenerational Household Katja lives with her older and younger brother, parents, and family friends in one house because of Germany's recession.
Sweet Tooth
The Knights Who Say Squee Katja gets ahold of a few comic books in Chapter 5 and becomes a fangirl for Captain America.
Tomboyish Ponytail Ponytails were actually in style for women in the 60s, but Katja seems to wear her hair up for practicality.

Lukas

(Scout)

Brother-Sister Team Subverted. Scouts and Medics aren't a good combination, in-game or otherwise.

Zach

(Pyro)

Red-Headed Hero Zach jokingly calls himself a ginger, which leads to Katja bestowing upon him the unfortunate nickname 'Ginger'.

BLU Team

The Medic

(Name: Heilwig)

Affectionate Nickname Jokingly refers to Katja as 'Wei�wurst'. (Wei�wurst is a Bavarian specialty that is rarely eaten anywhere else besides Bavaria.) A similar term could be considered pejorative, but given Heilwig's respectful nature, it is most likely meant to be cute.
Conveniently an Orphan Implied in Chapter 4 when he receives no mail when everyone else does. It could also be a case of Abusive Parents.
Herr Doktor Subverted. He has a heavy accent, but he states that he has trouble understanding Diethelm.
Kubrick Stare Performs this, almost exactly as described, in chapter 4.
Major Injury Underreaction Very canon for the Medic. He does not seem overly concerned about his major burns.
Self Stitching Bandages and treats his own wounds in Chapter 4. Justified in that he is the only Medic for the BLU Team.

The Heavy

(Name: Evgeniy)

The Soldier(Name: goes by John)

Positive Discrimination He appears to treat Leah better than the others, but this could be more related to the fact that she's also a crazed patriot and soldier and he naturally respects her more.

The Scout

(Name: Alex)

The Engineer

(Name: William)

Wouldn't Hit a Girl Subverted. He says this, but then he punches Katja in the face.

The Demoman

(Name: Aiden)

The Spy

(Name: S�bastien)

The Sniper

(Name: Cameron)

The Pyro

(Name:Fiammetta Marcello)

Clean Pretty Reliable Subverted. Fiammetta, suffering from an asthma attack at the time, reacted to CPR by vomiting(on the RED Scout, no less). The only reason it was even done was to keep her breathing until someone came with oxygen and drugs.
Meaningful Name 'Fiammetta' combines the Italian word 'fiamme' meaning fire, and a feminine suffix.
Samus Is a Girl Revealed to Katja and Leah when Fiammetta is injured.
Sweet Polly Oliver
Revealing Injury Because the BLU Medic is a male, Fiammetta goes to Katja for assistance.

Recruits

Logan

(Sniper)

Not the Fall That Kills You Averted. Logan is knocked out of the Sniper battlement by the RED Spy. He tries to grab at a ledge, ends up breaking his arm, then just dies from fall damage when he hits the ground.

James

(Spy)

Hitman Witha Heart
Leah: Too high. Was that a backstab or a stab in the neck? Didn't the Spy teach you how to do it?
James: I thought it'd be less painful and much quicker if I went higher...

Leah

(Soldier/Private)

Military Brat Her parents are unknown, but is a soldier, and John the BLU Soldier seems to treat her as a child or a little sister.
Morality Pet Possibly one to the BLU Soldier.