My list is incomplete, Fallout, Elder Scrolls, Soul Calibur, Loaded, The Darkness, Legend of Zelda, Lollipop Chainsaw and a few others are missing but I will add them at some point. The list will be longer soon enough, a few have some form of plot that may need a work around. The first six games is something I really want to though I welcome the rest of them as well.

Bold = Me

Mortal Kombat:

-Sindel x Kitana
-Kitana x OC (or MK character)
-Mileena x OC (or MK character)
-Mileena x Kitana
-Reptile x MK
-Sonya Blade x Jaxx
-Good MK Character x Bad MK Character
-Good MK Character x Good MK Character
-Bad MK Character x Bad MK Character
-MK Character x MK Character
-[b]Sub-Zero (or Cyber Sub Zero) x Scorpion (or Noob Saibot)
-OC x OC

Timesplitters:

-Jo-Beth Casey x Sgt Cortez
-Gretel x R-108 (or 109/110)
-Corp Hart x Sgt Cortez
-Viola x OC (or TS character)
-Chastity x OC (or Ghost or TS character)
-Iisa Nadir x TS Character (or OC)
-OC x OC
-TS Character x TS Character

(Possibility of doing a TS2 thing were we change upon the time period we are in)

Perfect Dark:

-Joanna Dark x Velvet Dark
-Joanna Dark x Jack Dark
-Joanna Dark x Elvis (Maian)
-Joanna Dark x OC
-DP Character x DP Character
-OC x OC

Bioshock-1, 2 and Infinite:

-Elizabeth x Booker
-Elizabeth x Elizabeth
-Splicer x Splicer
-Big Daddy x Big Sister
-Elizabeth x Jack
-Eleanor x OC
-Eleanor X Elizabeth
-OC x OC

Borderlands:

-Tiny Tina x Vault Hunter
-Tiny Tina x OC
-Tiny Tina x Roland
-Lilith x Maya
-Vault Hunter x Vault Hunter (Singles)
-Vault Hunters x Vault Hunters (Doubles)
-OC x OC

F-Zero+Cross Over:

-Captain Falcon x Jody Summers
-Captain Falcon x OC
-F-Zero Character x F-Zero Character
-Captain Falcon x Samus
-OC x OC

(These ideas will be based around the style of GTA/Saints Row 1 and 2
The Cross over will be a Metroid x F-Zero like RP)

Left 4 Dead:

-Survivor x Survivor
-Witch x Survivor
-Witch x Special Infected
-Survivor x Special Infected
-OC x OC

Hunted:

-Caddoc x E’lara
-Caddoc x OC
-E’lara x OC
-OC x OC

Golden Sun:

-Issac x GS Character
-Felix x GS Character
-OC x OC

Star Fox:

-Fox x Krystal
-Fox x Falcon
-Fox x Wolf
-Wolf x Krystal
-SF Character x SF Character

Street Fighter:

-Poison x Ryu
-Poison x Ken
-Chun Lee x Ryu (or Ken)
-Poison x Chun Lee (or another Female)
-SF Character x SF Character
-OC x OC

More to come.

I see your Bioshock fandom listed here and would love to do one. Dunno how I feel about Booker X Elizabeth since... well... ending. But I'd like to try an Elizabeth X Jack one (even though I never played the original, I'm quite versed in it's lore thanks to research and wiki pages) or an OC X OC one. The OC X OC one I had in mind were citizens of Rapture, or Columbia, whichever city you wanted, in the middle of all the chaos trying to escape the city.

PM me if you're interested! :D