For those who aren't familiar with Unreal Tournament 2004, it was a popular First Person Shooter game released back in 2004 by Epic Games. This thread will include the list and downloads of the most common skins and models I use, post your skins here aswell.
Updated: 11/5/12

Ayane
http://www.gamefront.com/files/4406275/Ayane_Model

Agent Smith + Voicepack
http://www.gamefront.com/files/3232491/Agent_Smith
Voicepack
http://www.mediafire.com/?u8kq7wcykk47rn4

Arnold Schwartzenegger + Voicepack
http://www.mediafire.com/?zezlu3vnt5ikb7y

Barney + Voicepack
http://www.mediafire.com/?nifoayttecd14t2

Beavis and Butthead
http://privatetux.tuxandroid93.net/voicepacks/malechars/beavisandbutthead.shtml#download

Comic Skins (Batman, Spiderman, Wolverine, The Thing, Hulk & Green Lantern)
http://www.mediafire.com/?wrfphs1ra441u6k

Duke Nukem
http://www.mediafire.com/?iq8xakk2eoaf3xy
Voicepack
http://www.mediafire.com/download.php?tokogj1vz1o0yym

Frylock
http://gamebanana.com/ut2k4/skins/13866

Goku
http://www.disastrousconsequences.com/dcforum/posts/list/5132.page;jsessionid=AECB079DB73A1F7D4DA37C1623C6B315

Gumby
http://www.gamefront.com/files/files/868181/gumby_ut2k3.zip

Homer Simpson
http://www.utzone.de/forum/downloads.php?do=file&id=856_Homer-Simpson-SkinPack

Joker
http://www.mediafire.com/?vdsdt8994sqn98f

Junkyard Mech
http://gamebanana.com/ut2k4/skins/14188

Master Shake
http://www.utzone.de/forum/downloads.php?do=file&id=861&langid=2

Kasumi
http://www.gamefront.com/files/4294678/ut2k4mdl_kasumi_zip

Karl-Gerat
http://xenoaisam.mysyslance.com/portfolio/mecha-musume-karl-gerat/

Knuckles Chaotix Team
http://www.mediafire.com/download.php?syakx7d5if704s4

Kos-Mos
http://www.gamefront.com/files/9071700/ut2k4mdl_kosmos_zip

Link
http://www.utzone.de/forum/downloads.php?do=file&id=4081_Link-from-The-Legend-of-Zelda-v10.0

Mega Man Legends Model Pack
http://www.gamefront.com/files/20883576/MML64_Model_Pack_v3.rar

Naluri + Voice Update
http://xenoaisam.mysyslance.com/portfolio/naluri-v3/
Voice Pack Update [Requires Rokiahi]
http://www.mediafire.com/?9bc2xpqxdayd6ty

Pikachu
http://www.utzone.de/forum/downloads.php?do=file&id=3667_Pikachu

Resident Evil: Jill, Leon, Claire, Chris + Voicepack INT Fix
http://www.mediafire.com/?11cz7bwtkwkcgm9
Voicepack
http://www.mediafire.com/?lb2bn92we87zv2f
INT Fix
http://www.mediafire.com/?y0j68lja04pabdf

Rohani + Voice Update
http://xenoaisam.mysyslance.com/portfolio/rohani-v1/
UPL Update [Requires Rokiahi]
http://www.mediafire.com/?11s3bt9248xbngp

Rei Ayanami [Neko Suit] + UPL Fix
http://www.gamefront.com/files/3830696/Neko_Rei
UPL Fix
http://www.mediafire.com/?mwitsdejke7b9m8

Rokahi/Haruhi
http://xenoaisam.mysyslance.com/portfolio/rokiahi-v2/

Sion Eltnam Atlasia
http://www.gamefront.com/files/3673755/Sion

Sherman Armored Infantry
http://xenoaisam.mysyslance.com/portfolio/mecha-musume-sherman-armored-infantry/

Sonic The Freedom Fighters
http://www.mediafire.com/?41qz7uv58wruvvm

Solid Snake
http://www.mediafire.com/?ee7g2nypp6uvmb2

Super Mario + Metal Mario
http://www.gamefront.com/files/4224541/Super_Mario_Skin

Super Luigi + Metal Luigi
http://gamebanana.com/skins/15523

Tifa Lockhart
http://www.gamefront.com/files/3191411/Tifa_Lockheart

Vivi
http://xenoaisam.mysyslance.com/portfolio/vivi/

VOCALOIDs Pack (Miku & BRS)
http://xenoaisam.mysyslance.com/portfolio/hatsune-miku-black-rock-shooter/
Miku Voicepack & Portrait Update
http://www.mediafire.com/?h9db63voj63ujv2

Zero Suit Samus
http://www.mediafire.com/?5t1j5f576ed15m3

Will update later.

Finally. Thanks.

Updated.

Added Mario and Luigi.

Updated 11/21/12