Asuka Tsuchimiya
Voiced by: Tomoyo Kurosawa
- Genki Girl: She's very cheery and energetic.
- The Leader
- I Will Find You: She spends the series hopping alternate universes looking for any sign of her missing little brother. She never does find him, in any universe—a bitter pill she finally forces herself to swallow, allowing her to move on.
- Nice Girl
- Stepford Smiler: Yuu eventually calls her on this, suggesting she only projects a cheery mask to hide her sadness.
Yuu Tounaka
Voiced by: Lynn
- Childhood Friends: She's been friends with Asuka since they were children, including when Kyouhei disappeared. In the Emissary of Twilight's home Fragment, Yuu moved away soon after Kyouhei's disappearance, leaving her without any emotional support and thus leaving her vulnerable to the Twilight's influence.
- Cloudcuckoolander's Minder: She's the one who tries the hardest to keep Asuka grounded in reality.
- Rocket-Powered Weapon: Her Equalizer form wields a rocket launcher that can transform into a rocket-powered hammer.
- The Lancer
Mia Silverstone
Voiced by: Nao Tōyama
Nana Nanase
Voiced by: Ami Koshimizu
Chloe Morisu
Voiced by: Marina Inoue
"Seriousuka"
Voiced by: Tomoyo Kurosawa
An alternate version of Asuka from the first Fragment the girls traveled to.
- Alternate Self: To Asuka.
- Hero of Another Story: She's been fighting the Twilight for some time before the story started.
- Precursor Hero: Her Fragment has been at the forefront of the war against the Twilight for some time, and they invented the Astral Module technology that Equalizers all around the Multiverse use.
- Take Up My Sword: Once her Fragment falls to the Twilight, our Asuka realizes that they will have to take up her cause in her stead.
"Sexy Yuu"
Voiced by: Lynn
An alternate version of Yuu from another Fragment.
- Alternate Self: To Yuu.
- Ms. Fanservice: To Yuu's embarrassment, considering it's also her body that she's flaunting.
- Sharing a Body: With the main Yuu in Episode 9, when the main Yuu inhabits her as a Link.
The King of Twilight
The entity at the head of the Twilight.
- Big Bad: Seriousuka believes that this being is in charge of the Twilight and that defeating him will end its threat.
- The Ghost: They never actually find him, and it's left ambiguous whether he even exists at all.
The Emissary of Twilight
Voiced by: Tomoyo Kurosawa
- The Ageless: Having become the Emissary at a young age, she's stopped aging and appears younger than her counterparts.
- Alternate Self: To Asuka.
- The Dragon: To the King of Twilight, if he exists; to the Twilight itself, at least.
- The Unfought: As Asuka manages to Break Her By Talking instead of defeating her in battle.
