I have found a massive pack on the web for GMod with a wooping 70 models (if I counted right).
To thoce who don't know TimeSplitters, imagine a game made by the guys who made Goldeneye64 and Perfect Dark, with the same style, play, feel, but... insane amount of craziness and oddities:
Robots, Ducks, Space Marines, Aliens, Martial Artists, Circus Freaks, Gangsters, Secret Agents, Redshirts, Super Villians and more fighting in a Chinese Restaurant with Flamethrowers, Bricks and Crossbows.
Perhaps these models would be great as player models in OC?

Here's the link for the pack: http://filesmelt.com/dl/Timesplitters_2.rar
Password: s84je32
And a pic of what you get:

From left to right:
Accountant, Aztec Warrior, Badass Cyborg, Bettleman, Big Tony, Braces, Captain Ash, Captain Night(?), Chassis Bot, Chastity Chase, Chinese Chef, The Colonel, Sgt.Cortez, The Cropolite, Jakob Crow, Drone Splitter, Dr.Peabody, Envirosuit, Fergal Stack, Gargoyle, Ghost, Gregor Lenko, Gretel MK-II, Hank Nova, Harry Tipper, Hector Baboso, Henchman, Hunchback of Notredame, Hybrid Mutant, The Impersonator, Insect Mutant, Ivor Baddic, Jake Fenton, Jacque de la Morte, Jebediah Crump, Jikki, Jungle Queen, Khallos, Kitten Celeste, Lady Jane, Leo Krupps, Leonid, Ilsa Nadir, Maiden, Male Trooper, Meezor Mox, Mikey Two-Guns, Milkbaby, Mr. Giggles, Mr. Underwood, Ninki, Nikolai, Ozor Mox, Reaper Splitter, Ring Mistress, Riot Officer, Sadako, Scourge Splitter, Sentrybot (?), Sergio, Sgt. Shivers, Slick Tommy, The Master, Trooper Black, Undead Priest, Viola, R-109, Crypt Zombie, Feeder Zombie, Sewer Zombie
Credit goes too:
Silverlan ( NPC's )
Nexus Elite ( Few rigs )
Acrono ( Gretel, R110 )
Me ( 50+ Rigs )
Skaarj ( 5 Rigs )
Henry Townshend ( Rigs )
F T ( Creating physbox's )
Bluedyeno ( Physbox and some compiles )
Omolong ( Compiles )