Animals: (Suggested by some captains already)

Milton's Monkeys
Murdoc's Mice
Nitram's Nighthawks / Night Crawlers
Paradoks Penguins / Piranahs
Zero's Zebras
Bps Bats
Carapace's Cockroaches / Cats / Camels / Chickens /
Striker's Seals / Serpents / Snakes / Sheep
Darkki's Dingos / Dinosaurs / Donkeys / Dopefishs /
En_Karl's Eagles / Eels / Elephants /



Some other suggestions:

Milton:
Murdoc: The A-team
Nitram: The Rams
Paradoks: Punishers
Zero:
Bps: Lethal Wizards
Carapace: Pace 'till Death / Death Pace
Striker: First Strike
Darkki:
En_Karl:

Instead of animals i'd say the Quake enemies would be more suitable;

Death Knights
Grunts
Fiends
Shamblers
Spawns (these are the blobs :p)
Vores
Ogres
Enforcers
Knights
Zombies
Rotfishes
Scrags

Cockroaches?

Milton's Cavemen
Murdoc's Murlocs
Nitram's Rams
ParadokS' Parody
Zero's Heroes
Bps' Lethal Wizards <- agreed.
Carapace's lost in Space
Striker's Hitchhikers
Darkki's Dark Passengers
En_karl and his team <- since en_karl means a_man

Striker: Striceforce / Striceforce 1
Darkki: Nightstalkers
En_Karl: Five_Men Army

YES!

Carapaces's Cameltoes

Milton: Milli Vanilli
Murdoc: Sherlock
Nitram: Hitscan
Paradoks: Amokk
Zero: Antilag
Bps: Big Penises
Carapace: Moneyshot
Striker: Union Reps
Darkki: Coop
En_Karl: Dr Phil

This was great

Ola Carapaces ?

Milton's obsoletes
Murdoc's donkeys
Nitram's teamkills
Zero's Smashing Pumpkins
Paradoks' New Interview Objects
Bps' Lethal Wizards (liked this)
Carapace's skeleton ()
Strikeforce
Darkki's Light
En_karl's New Tele Guys

Milton's LeatherCoats
Paradoks' CheapoCheaters

or perhaps:

Milton's GaminGloveRS ?

some more "serious" suggestions:

Milton: Certain Death | Too Fast | 2fast Crew
Murdoc: The A-team | Murdoc's A-team (Murdoc is from A-team if you don't connect)
Nitram: The Rams
Paradoks: Paramilitaries | Paradoks Paramilitaries
Zero: Sneakers
Bps: Lethal Wizards
Carapace: Death Pace
Striker: First Strike
Darkki: Shadows
En_Karl: Five_Man Army (En_Karl means A_Man or possibly One_Man)

ParadokS and two Pairs of sockS

Milton's Minions

Milton's Militia
Fire_Karlar
Martins Martians

Milton's Red Staplers

Zeros YA Stealers
Murdocs RA/MEGA Keepers

Murdoc's LG->LIFTS->SNG->BACKSTABBERS

Updated and hopefully improved upon my suggestions:

Milton's Cavemen
Murdoc's Murlocs
Nitram's Lambs
ParadokS' Rocks
Zero's Heroes
Bps' Huge Mess
Carapace's Nutcases
Striker's Hitchhikers
Darkki's Bliss
En_karl's Snarl