"Connections" Season:

This would be a Blood vs. Water-esque season, thought of long before Blood vs. Water was on air. This is dating back to after Survivor: Seireitei Forest.

Males: Toji Suzuhara (Evangelion), Yumichika Ayasegawa (Bleach), Itsuki Koizumi (Haruhi Suzumiya), Near (Death Note), Sasuke Uchiha (Naruto), Roy Mustang (Fullmetal Alchemist), Ikkaku Madarame (Bleach), Max (Pokemon), Mello (Death Note)

Females: Hikari Horaki (Evangelion), Madison Taylor (Cardcaptors), May (Pokemon), Riza Hawkeye (Fullmetal Alchemist), Sakura Haruno (Naruto), Sakura Avalon (Cardcaptors), Yuki Nagato (Haruhi Suzumiya)

Note how some of these players made it on to Survivor: Rivals. Koizumi, Near and Sakura Haruno made it on to my most recent season. And for some reason there was an uneven number of males and females - I counted Sasuke as a female by mistake.

Unnamed Season 1:

Males: Kensuke Aida (Evangelion), Fuhrer King Bradley (Fullmetal Alchemist), Tori (Cardcaptors), L (Death Note), Miroku (InuYasha), Mamoru Chiba (Sailor Moon), Vicious (Cowboy Bebop), Genma Saotome (Ranma 1/2)

Females: Kikyo (InuYasha), Minako Aino (Sailor Moon), Dawn (Pokemon), Ayeka (Tenchi Muyo!), Karin Kurosaki (Bleach), Hinata Hyuga (Naruto), Tsuruya (Haruhi Suzumiya), Ryoko Asakura (Haruhi Suzumiya)

Several of these players made it on to future seasons. Kikyo, Ayeka and Asakura all made it on to Survivor: Xing, while Minako won Survivor: Hikawa Shrine, which Mamoru (Tuxedo Mask) hosted.

Unnamed Season 2:

Males: Rock Lee (Naruto), Tracey Sketchit (Pokemon), Julian (Cardcaptors), Sesshomaru (InuYasha), Kaneda (Akira), Matsuda (Death Note), Ranma Saotome (Ranma 1/2), Punch (Cowboy Bebop)

Females: Ritsuko Akagi (Evangelion), Nel (Bleach), Winry Rockbell (Fullmetal Alchemist), Faye Valentine (Cowboy Bebop), Washu Hakubi (Tenchi Muyo!), Setsuna Meioh (Sailor Moon), Hotaru Tomoe (Sailor Moon), Yukino Miyazawa (His and Her Circumstances)

Some of these players as well made it on to future seasons. Setsuna and Hotaru were on Survivor: Hikawa Shrine, while Ritsuko, Faye and Yukino were on Survivor: Xing.

Unnamed Season 3:

Males: Miroku (InuYasha), L (Death Note), Sesshomaru (InuYasha), Kaneda (Akira), Ranma Saotome (Ranma ), Kensuke Aida (Evangelion), Rock Lee (Naruto), Mamoru Chiba (Sailor Moon)

Females: Rei Ayanami (Evangelion), Ritsuko Akagi (Evangelion), Faye Valentine (Cowboy Bebop), Ryoko Asakura (Haruhi Suzumiya), Tsuruya (Haruhi Suzumiya), Yukino Miyazawa (His and Her Circumstances), Kikyo (InuYasha), Ayeka (Tenchi Muyo!)

As you can tell, this was a mish-mash of Unnamed Seasons 1 & 2. I took the best from both seasons, added in Rei Ayanami, and considered it a future season.

Family Feud:

My "real" Blood vs. Water season, this one never got off the ground due to personal problems that caused me to step away from writing for a while.

Returning players (original season): Cynthia (Shamouti Island), Sango (Feudal Japan), Light Yagami (Seireitei Forest), Mayuri Kurotsuchi (Hueco Mundo), Hotaru Tomoe (Hikawa Shrine), Italy (Axis vs. Allies), Finnick Odair (Panem), Sabrina (Shamouti Island), Loly Aivirrne (Xing), Sindel (Tropical Jungle)

Loved ones (relation): Carolina (Cynthia's grandmother), Miroku (Sango's husband), Sayu Yagami (Light's sister), Nemu Kurotsuchi (Mayuri's daughter), Dr. Tomoe (Hotaru's father), Romano (Italy's brother), Annie Cresta (Finnick's wife), Mr. Saffron (Sabrina's father), Menoly Mallia (Loly's sister), Kitana (Sindel's daughter)

There were also a lot of other names thrown out for this season. InuYasha & Sesshomaru, Rei Hino & Yuichiro, Temari & Kankaro, Ichigo Kurosaki and Isshin Kurosaki, Russia & Belarus, Rangiku Matsumoto & Gin Ichimaru, Silver & Giovanni, Kaname Chidori & Sousuke Sagara, Suzuka Asahina & Yamato Akitsuki, Gary Oak & Professor Oak, Mario & Luigi, and Kohaku as a possible match with Sango instead of Miroku.

Tropical Jungle 2:

After my failure due to personal reasons that caused the cancellation of Survivor: Tropical Jungle, I wanted to try a 2nd season with some of TJ's players, some new players, and the hosts playing the game as contestants. Here's how the opening tribes would have looked:

TJ's players: Allison White, Palutena, Isabelle, Chun-Li, Lucina, Kitana, Katherine

New players (+ Ben): Ben Tan, Tsuruya, Esther Blanchett, Sakura Haruno, Madison Taylor, Ryuko Matoi, Leafa

Hosts: Jet Black, Jeff Probst, Tuxedo Mask, Caesar Flickerman, Ancient Rome, Professor Ivy, Kisuke Urahara

Actual host: Cynthia

Probably the most intriguing of all the seasons that was cancelled.

Survivor: Minos Korva

Picard, Kirk, Janeway, Sisko, Archer, Riker, Madred, Data, Geordi, Troi, Beverly, Worf, Spock, Uhura, Chekov, Sulu, Bones, Scotty

So there you have it! Those are the seasons that never got off the ground. That's not to say there aren't others lurking as possibilities...