First off, a shout-out to any horror fandom characters! We definitely want you and your expertise! This is definitely including, but by no means limited to, Silent Hill, Fatal Frame, Resident Evil, Coraline, Shadow Hearts, and Haunting Ground!

We also have a solid handful of canons so far--and not only do we accept most fandoms, but we also are open to AUs and Original Characters as well! In fact, we have a growing cast of diverse OC's and would love to have more to join them! Anyone is welcome, of course, but casts you could app into are:

The 4400:
Taken: Maia Rutledge
Wanted: Anyone

9
Taken: 7
Wanted: Anyone!

Air Gear:
Taken: Akito/Agito/Lind Wanijima
Wanted: Simca, Ringo, Kazu

American Horror Story:
Taken: Vivien Harmon
Wanted: Anyone!

Axis Powers Hetalia:
Taken: Lovino "Romano" Vargas/South Italy, Alfred F. Jones/America, England/Arthur Kirkland
Wanted: Anyone!

Being Human (UK):
Taken: Alex Millar
Wanted: Tom, Annie, Cutler, Snow, Pearl, Leo, and everybody!

Bleach:
Taken: Hollow Ichigo, Orihime Inoue, Tensa Zangetsu
Wanted: Ichigo Kurosaki, Rangiku, Renji, Rukia, Sado, Sora, Tatsuki, Uryuu, Grimmjow, Syazel, Luppi and Nnoitra. Just more Bleach!

Buffy the Vampire Slayer:
Taken: Buffy Summers
Wanted: Anyone at all would be awesome!

Castlevania:
Taken: Alucard, Soma Cruz, Annette Renard
Wanted: Anyone!

The Chronicles of Narnia:
Taken: Aslan
Wanted: Anyone

The Chronicles of Prydain:
Taken: Eilonwy
Wanted: Anyone

Chrono Trigger:
Taken: Magus
Wanted: Anyone!

Coraline:
Taken: Coraline
Wanted: Anyone!

D. Gray-man:
Taken: Kanda Yu
Wanted: Anyone

Death Note:
Taken: Light Yagami
Wanted: Ryuk, Sayu, Misa, or Near especially!

Doctor Who:
Taken: The Tenth Doctor, Jamie McCrimmon
Wanted: Anyone, but especially a Second Doctor!

Dragon Age: Origins:
Taken: The Warden/Daylen Amell, Zevran, Hawke
Wanted: Absolutely anyone, we'd love a bigger cast!

Elder Scrolls:
Taken: Ena
Wanted: Anyone!

Fatal Frame:
Taken: Rei Kurosawa
Wanted: Munakata, anyone!

Final Fantasy VII:
Taken: Sephiroth [AU]
Wanted: Anyone!

Final Fantasy IX:
Taken: Kuja, Vivi
Wanted: Anyone!

Firefly:
Taken: River Tam
Wanted: Simon Tam or Malcolm Reynolds especially! Or anyone!

Fullmetal Alchemist:
Taken: Nina, Hughes
Wanted: Anyone!

Galerians:
Taken: Rion
Wanted: Anyone

Harry Potter:
Taken: Sirius, Remus, we have a James interested
Wanted: Anyone at all!

The Hunger Games:
Taken: Peeta
Wanted: Anyone at all! We'd just love more.

Ib:
Taken: No one, currently
Wanted: We'd love to see the start of a cast!

Justified:
Taken: No one yet!
Wanted: Boyd Crowder please

Katekyo Hitman Reborn
Taken: Chrome, Giotto, Mukuro (canon and AU), Spade, Tsuna, Ken, Chikusa, Gokudera, Hibari, Yamamoto
Wanted: Ugetsu, Kokuyo, Hibari Kyouya, Alaude, M.M., Lancia, Fran, Arcabaleno, Vindice!

Kingdom Hearts
Taken: Braig, Lea, Lexaeus, Sora (AU), Vexen (AU), Zexion/Ienzo
Wanted: Ansem the Wise/DiZ, Xaldin/Dilan

Last Herald Mage:
Taken: Starwind k'Treva
Wanted: Anyone!

Litchi Hikari Club:
Taken: Kanon
Wanted: Jaibo, Nico, Zera, Raizou or anyone!

Magic Kaito:
Taken: Aoko Nakamori, Saguru Hakuba, Kuroba Kaito
Wanted: Akako please!

Marvel Comics:
Taken: Faiza, Molly Hayes
Wanted: A Captain Britian and MI: 13 cast would be delightful, especially Black Knight/Dane Whitman! More Marvel in general, though.

Marvel MCU:
Taken: Stever Rogers, Bucky, Loki, Phil Coulson, Natasha Romanoff (all movie-verse)
Wanted: Thor, especially, but the Avengers in general and anyone at all!

Mercedes Lackey's Velgarth Books:
Taken: No one, we'd love to start a cast!
Wanted: Vanyel Ashkeveron especially, but anyone!

Les Misérables:
Taken: Éponine Thénardier
Wanted: Anyone!

Naruto:
Taken: Uchiha Shisui, Uchicha Itachi
Wanted: ANYONE AND EVERYONE EVER. We would adore the older and obscure characters--parents like Fugaku and Hiashi and even Chiyo, or the support cast like Ibiki and Iruka, or even blasts from the past like Sandaime or Danzou or Minato. Villains would be wonderful, too, both Akatsuki and otherwise. We would love to see if we could assemble the whole Hyuuga family here, Neji, Hizashi! I know there must be people with those muses out there. Headcanon is welcome!

Parasite Eve:
Taken: Eve Brea
Wanted: Anyone!

PGSM Sailor Moon:
Taken: Mizuno Ami/Mercury
Wanted: Anyone!

Pokémon:
Taken: Leaf
Wanted: Anyone!

Rise of the Guardians:
Taken: Jack Frost
Wanted: Anyone!

Rule of Rose:
Taken: Jennifer
Wanted: Anyone

Saints Row:
Taken: Alex Marino
Wanted: Anyone!

Sengoku Basara:
Taken: Date Masamune
Wanted: anyone!

Shin Megami Tensei: Nocturne:
Taken: Naoki Kashima
Wanted: Anyone!

Silent Hill:
Taken: James Sunderland, Heather Mason, Murphy Pendleton, Vincent
Wanted: Anyone!

Soul Eater:
Taken: Crona/Ragnarok
Wanted: Anyone!

Star Trek:
Taken: Spock and Kirk!
Wanted: Anyone

Stray Souls:
Taken: The Knitted Doll
Wanted: Anyone

Supernatural:
Taken: Ben, Castiel, Dean, John, Lucifer, Mary, Rachel, Sam and probably a Gabriel coming back
Wanted: Adam, Lisa, Raphael, Milligan, Chuck, Crowley!

Tengen Toppen Gurren Lagann:
Taken: No one yet
Wanted: Kamina!

Tortall Series:
Taken: No one, sadly!
Wanted: Nealan of Queenscove, Alanna of Pirate's Swoop, Olau, Numair Salmalin, Veralidaine Sarrasri, Thom of Trebond, Duke Roger

Transformers:
Taken: Wing
Wanted: Anyone!

Twin Peaks:
Taken: Laura Palmer
Wanted: Anyone, but especially Bobby and Cooper

Vagrant Story:
Taken: Callo Merlose
Wanted: Anyone!

Witch's House:
Taken: None yet
Wanted: We'd love to see the start of a cast!

Witchworld:
Taken: Khemrys
Wanted: Anyone!

Woman in Black:
Taken: Kipps
Wanted: Anyone

X-Men:
Taken: Charles Xavier (First Class version)
Wanted: Erik and Raven!

Yume Nikki:
Taken: No one
Wanted: We'd love to see the start of a cast!