- Voiced by: Kensho Ono (Japanese), Nathan Sharp (English)
The protagonist. He was one of ALCA's Logicalists in the past until he lost his partner about a year ago. Now, he finds a new partner in Athena and joins as the new leader of
- Experienced Protagonist: He's been a Logicalist for some time by the start of the series.
- The Leader: Assumes this position as of episode 2, due to his previous experience.
- Nice Girl: The straightest example in the show, being kind and patient with just about everybody.
- Defrosting Ice Queen: She starts off pretty cold towards Yoshichika, but warms up to him after the events of episode 3. The following episode shows just how much, with her concern over how he was injured from Cloe's recklessness, and her vowing to protect him.
- The Lancer: To Tsurugi.
- The Leader: At least, she was until Yoshichika suddenly showed up and more or less took it from her. This was the main reason why she was so cold to him at first.
- Red Oni, Blue Oni: Blue to Cloe's Red.
- Thou Shalt Not Kill: Episode 3 shows that she has a problem with killing her opponents. Yoshichika having a similar opinion is what gets her to warm up to him.
- Ancient Grome: Unlike Athena and Artemis, she goes by her Roman name rather than her Greek name, Aphrodite.
- Love Freak: Well, when you have the name of the goddess of love, it's kind of expected.
- The Big Guy: Brute strength and enthusiasm is where she shines.
- Calling Your Attacks: And they will inevitably involve Department of Redundancy Department.
- Red Oni, Blue Oni: Red to Tamaki's blue.
- Cold Sniper: She shows little to no emotion when using her sniper rifle.
- Parental Abandonment: Her parents pretty much left her in basket.
- Parental Substitute: In a addition to being Mana's partner, Artemis also acts like a surrogate mother.
- Voiced by: Aimi Terakawa (Japanese), Jeannie Tirado (English)
- Voiced by: Ryu Nakatani (Japanese), Chris Guerrero (English)
- HeelFace Turn: He was an antagonist for his first few appearances, but ends up becoming Yukari's partner.
- Voiced by: Risa Mizuno (Japanese), Janelle Lutz (English)
- Voiced by: Yoshitsugu Matsuoka (Japanese), Ian Moore (English)
- Jerk with a Heart of Gold: He's an arrogant individual, but he shows he's got a good side when he lectures Tsurugi so he can make up with Athena.