Warning: Simply knowing some of the crossovers involved can lead to spoilers.
The authors have their own character guide. Many of these characters can also be found elsewhere on the wiki, on pages such as: Ranma ½, Sailor Moon, Rival Schools, Street Fighter, Blue Seed, Guyver, Hellsing, The King of Fighters, Resident Evil, Darkstalkers, Revolutionary Girl Utena, Read or Die and Tenchi Muyo!.
Books 1 & 2, Pre-Chapter 21 Time Skip
Aaron Peori (Self-Insert)
- Fanfic author, Voice in Head.
- Emotion Suppression: He spends most of his time ice-cold to better suppress a well-spring of rage.
Ukyou Kunoji (Ranma ½)
- Martial Arts Death Machine, Okonomiyaki chef.
- Sweet Polly Oliver: A vow she made after a childhood encounter with Ranma.
Doctor Tofu Ono (Ranma ½)
- Healer and Chi Master.
Akira Kazama (Rival Schools)
- Martial Arts Death Machine, Motorcycle rider.
- Bifauxnen: In her helmet and leathers.
- Fanfic author, Energy Parasite.
- Body Surf: He's forced to do this due to the caustic nature of his energy.
Pink (Ranma ½)
Link (Ranma ½)
Sailor Pluto (Sailor Moon)
- Sailor Senshi, Defender of the Gates of Time.
- Well-Intentioned Extremist: She's the leader of a group formed to kill Ukyou before she can end the world. She feels the same way about Hotaru/Saturn, although to a much lesser degree.
Rose (Street Fighter Alpha)
Usagi Tsukino - Sailor Moon (Sailor Moon)
- Sailor Senshi.
- Sweet on Polly Oliver: She's torn between her feelings between Tuxedo Mask and Ukyou.
Minako Aino - Sailor V (Codename: Sailor V)
Telulu (Sailor Moon)
- A merge between demon and human who resents her place in the power structure.
Tethys (Sailor Moon)
- Water youma.
Hayato Myoujin (Ranma ½)
- Martial Arts Death Machine, Rival of Ukyou, Takoyaki Chef.
- Body Absorber.
Rip Van Winkle (Hellsing)
- Vampire with magic gun.
Vega (Street Fighter II)
- Martial Arts Death Machine, Narcissistic Killer.
Book 3 & Side-Stories, Post Time Skip
Ukyou Kunoji - Lotus Infinite (Ranma ½)
- Ultimate assassin, able to phase through matter.
Angel (The King of Fighters)
Kalia (Based on a character from El-Hazard: The Magnificent World)
- Energy Construct, Reality Warper.
Akane Tendo (Ranma ½)
- Martial Arts Death Machine, Rebel Leader.
Cologne (Ranma ½)
- Martial Arts Death Machine, Youthened to the height of her power.
Lady Bison (Street Fighter II)
- Martial Arts Death Machine, Ruler of Shadaloo.
Rip Van Winkle (Hellsing)
- Upgraded by Alexia Ashford. Bullets are now imbued with pieces of her flesh.
Princess Ayeka (Tenchi Muyo!)
- Part of the Jurai Empire's Royal Family.
Washuu (Tenchi Muyo!)
Sailor Galaxia (Sailor Moon)
- Corrupted Sailor Senshi.