These are the four characters in Doom:

Lorelei Chen
Age: 27 Weight: 151  Height: 5’10”
Physical Description: Muscular, tall woman, attractive, but has strangely too-intense eyes.  Oriental featured in the brown eyes and black hair, which is drawn back into a large knot.  Scar on left shoulder from rock-climbing accident.
Character Description: Fiercely competitive, Lorelei intimidates most people.  She won her troop boxing championship.  Lost a bet that meant she had to pull her application for a glory post.  Too late to reapply, she got this post.  Married for six months once, husband divorced her for irreconcilable differences.  From European Alliance.  No one calls her Lorelei.
Advantages: Fast.  Crack shot with pistol.
Disadvantages: Once wounded, she still tends to push herself to compensate, so wounds can keep ticking off more.  Not used to bayonet.
 

John “Petro” Pietrovich
Age: 34 Weight: 190  Height: 5’9”
Physical Description: Black balding man with thick eyebrows.  Missing last joint of right ring finger.  Brown eyes.
Character Description: Former head of security at AWR (Advanced Weapons Research) Labs, Petro grew tired of the overwhelming bureaucracy of the UAAF.  His insubordination cost him his rank, and his assignment on Tei Tenga was his request, made to get away from the epicenter of annoyance while finishing out his term of duty.
Advantages: Good with standard shell weapons.  Can take damage.
Disadvantages: Average speed.  Not used to missile weapons.
 

Dimitri Paramo
Age: 37 Weight: 191  Height: 5’11”
Physical Description: Bulky, slightly overweight greek-spaniard with swarthy but unkempt looks.  Frizzly dark brown hair explodes and falls off his head.
Character Description: Dimitri is basically stuck in the low ranks of the military, but that suits him just fine.  He wants nothing more from life: give him a clear objective and the chance to release aggression through the freely available high-powered firearms, and he’s happy.
Advantages: Very good with a ll weapons.  Can take a lot of damage.
Disadvantages: Slow.
 

Thi Barrett
Age: 22 Weight: 130  Height: 5’6”
Physical Description: Red-haired and trim, Thi (Pronounced “Tee”) has piercing blue eyes, and is stout but gorgeous.  A toss of hair tends to fall over her forehead.  She holds a bewitching dimpled smile in reserve until it proves useful.
Character Description: Thi has a friendly, if straight-laced, disposition.  Father was a sargeant in the UAAF, a career soldier that gave Thi a strong sense of duty and honor.  Medalist in unarmed combat competition.  She volunteered for this post because no one wanted it, and with a desire to have a variety of experience in her military life.
Advantages: Faster than Average.  Hard to hit.  Does incredible damage with bayonet.
Disadvantages: Low hit points.

And of course, theres…

Buddy Dacote: the guy that dies
Age: 29 Weight: 202  Height: 6’2”
Physical Description: Very fit and powerful, Buddy always wears a hat that says “BEOS” which stands for “Butt End of Space.”  Caucasian with brown/Blond hair and green eyes.
Character Description: Popular and courageous, Buddy got sent to Tei Tenga Darkside for showing up a superior officer.  His stay here is just temporary though – he was sent here as a security advisor.  Buddy has a good sense of humor.  Inside Info: Dacote stands for “Dies at conclusion of this episode.”

OTHER NAMES
Roland Trague, Warren Apisa, Taradina Cassatt, Melanie “Butch” Bucelli, Janella Sabando