Jill Valentine Cosplay by Omi Gibson

Cosplayer: Omi Gibson
On DeviantArt
Official Website
Tumblr tag

Character: Jill Valentine (Resident Evil Biohazard 2 Apocalypse)
Photography: Taka

From cosplay sensation Omi Gibson, portraying character Jill Valentine from the Movie Resident Evil Apocalypse (2004).  Jill Valentine is a character from the Resident Evil franchise by Capcom.  First appearance in 1996 as one of the protagonists of the original Resident Evil game. 
Full Bio on Wikipedia

Mad Moxxi Cosplay by Jessica Nigri

Cosplayer: Jessica Nigri
Official Website
Facebook Fan page

Character: Max Moxxi (Borderlands 2)*

Photography: Ljinto (images 1,2) & Nerdcaliber (images 3,4)
Ljinto Flickr page
Nerdcaliber Website, youtube interview and more photos

A crowd pleaser from New York Comic Con 2012, Jessica Nigri is a cosplayer, gamer, comic book enthusiast and imho, surreal costume maker.  Check out her website for more luscious photoshoots and the chance to own your very own personalised 11x7 poster.  Don't forget to visit the Photographers links for more cosplay loveliness.

*Mad Moxxi DLC character in Borderlands the hostess of the Colosseum matches in The Underdome. In Borderlands 2 the thrice married vixen relocates to Sanctuary after Hyperion destroys the Underdome.

Guilty Crown Cosplay Inori Yuzuriha 楪いのり

Cosplayer: Miyuko
On facebook

Photography: Spiral Cats
On facebook

*Character:  Inori Yuzuriha  from Anime Guilty Crown

*Inori Yuzuriha is the principal female character from the sci-fi fantasy Anime, Guilty Crown. A member of the guerrilla resistance group called "Funeral Parlor".  Inori is portrayed initally as an emotionless character her focussed only on successfully completing her missions. Her fighting skills are so advanced, she can take on and defeat a group of GHQ soldiers at one time.

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League of Legends Cosplay Katarina

Cosplayer: Tasha
On Facebook
On spiral cats
Character: Katarina (League of Legends Game)

Katarina possesses the killer instincts of the Du Couteau Family, the elder sister of Cassiopeia Du Couteau, and a mortal rival of Garen, she is the one and only master of Talon.

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Saya Otonashi Blood+ Cosplay by Lenneth

Cosplayer: Lenneth
on DeviantArt
Interview on riuva.com

Character: Saya Otonashi (Blood+ Anime series)

Blood+ the anime series is based on the animated movie "Blood the last Vampire".  The series picks up a few decades after the events in the film. Under the care of an adoptive family, Saya has been living the life of a seemingly normal girl. But it isn't long before her memories start to surface and she remembers what her true purpose in life is and she resumes her fight against the Chiroptera, bat-like creatures who possess superhuman strength, speed and regenerating ability.

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Cosplay World of Warcraft Whitemane

Cosplayer: miyoaldy aka MiYo
Photography: Dukkeobi, Amu and Amaranth
Game: World of Warcraft
Character: *High Inquisitor Sally Whitemane
Cosplayer: miyoaldy aka MiYo

High res images and a goldmine of superb cosplay from MiYo's deviantart page

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*High Inquisitor Sally Whitemane is a character from the mmorpg World of Warcraft, a level 40 elite human boss found in the Scarlet Monastery's Cathedral.

Diablo 3 Demon Hunter Cosplay by Tasha

Cosplayer: "Tasha" member of the Spiral Cats Team
Character:  Female Demon Hunter from Diablo 3
Photography:  Sinme
And yes the costume was home made!! see Tasha's link page (Korean)

The Demon Hunter is a Character Class from recently released dark fantasy/horror action RPG by Blizzard Entertainment.

The Demon Hunter Class combines elements of the earlier Amazon and Assassin classes. Demon Hunters use regenerating resources of Discipline for defence and Hatred for attack, with their principal weapon being the crossbow, supplemented by small bombs, which are thrown at their enemies.

Official Diablo III Game Website

See also Female Monk Cosplay by Yun Jin Kang on Rendered Bits
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Revy Cosplay Black Lagoon Omi Gibson

Cosplayer: Omi Gibson
Character: Revy (Black Lagoon)

Character from the Manga and Anime series, Black Lagoon. Revy (Rebecca) does most of the fighting for Lagoon Company. She is of Chinese descent, and grew up in the United States, spending most of her youth as a thief and murderer. Revy is very competitive, easily bored, and quick to anger. Her skill with firearms and ability to dodge bullets seem superhuman. Also known as Revi, Levi.

Omi Gibson on Cosplay.com
Omi Gibson on American Cosplay paradise
Revy Wallpaper on Rendered Beauty
Black Lagoon Official Website (Japanese)

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Kasumi Cosplay Dead or Alive

Character: Kasumi from Dead or Alive Game series
Cosplayer: Kipi

Kasumi costume variants by the incomparable "Kipi"

Kipi fansite
Kasumi Wallpaper
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Cosplay Momohime 百姫 The Demon Blade 朧村正

Cosplayer: Witchiko (Brazil)
Photographer: andyamasaki (Brazil)
Character: Momohime 百姫, Miyuki Sawashirom Princess Momohime

Character from the action role playing Wii game Muramasa: The Demon Blade aka Oboromuramasa 朧村正.  A young and introverted princess of Narukami Han, Mino Province. Ends up being possessed by the spirit of Jinkuro, forced to flee her castle and head westward to Kyo from Edo.

Low Res images only, see full resolution shots by following links above.

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Cosplay with attitude Nana Osaki

Character Nana Osaki
Cosplayer: Hinata
Character from hit Anime series, Manga and Movie, Nana. Two young women, both with the name Nana, one with a punk backround (Nana Osaki) and the other (Nana Komatsu) with a naive upper middle class mindset, find each other in Tokyo as they pursue love and careers.

Hinata used to have her own forum on the Nana site, but sadly I can no longer find a link.

Nana Website