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USNA (The United States of the North American Continent)
Silvia Mercury First
Silvia Mercury First
Voiced by: Ai Kobayashi (Japanese), Rebeka Thomas (English)
- Blow You Away: Can carry messages by using air vibrations.
- Brutal Honesty: To her superior Lina.
- Code Name: Silvia is her first name, Mercury First are code names.
Michaela Hongou
Michaela Hongou
- Voiced by: Haruka Shiraishi (Japanese), Lisa Reimold (English)
- Affectionate Nickname: Her friends refer to her as Mia.
- But Not Too Foreign: Like Lina, she is Japanese-American. Unlike Lina, her appearance makes it easier for her to blend in with the crowds.
- Double Reverse Quadruple Agent: An unwilling case, as she is being controlled by a Parasite.
- Healing Factor: As a result of becoming a parasitic host, she can heal fatal wounds like getting stabbed in the chest.
- The Mole: Her role in the USNA, being an undercover agent tasked to infiltrate magic universities under the name "Mia Honda". It turns out she is also this in the conventional sense via Symbiotic Possession, as she is possessed by a villainous parasite to attack the heroes.
- Sacrificial Lamb: She is introduced as a meek but earnest confidant to Lina when the latter first arrives in Japan. Early into the arc, she is promptly killed off to show that the parasite the heroes are pursuing has no qualms about killing its hosts to ensure its survival.
- Shock and Awe: Electric balls.
- Taking You with Me: Used a suicide attack when cornered to kill her opponents and possess a more powerful host. Defeated by Tatsuya, she ends up possessing Pixie.
Virginia Balance
Virginia Balance
- Voiced by: Atsuko Tanaka (Japanese), Rachel Robinson (English)
- An Offer You Can't Refuse: After failing in her mission to uncover and neutralize Japan's secret Strategic Class Magician, Tatsuya, she ended cornered by the Yotsuba and accepted an under-the-table deal to stop her investigation in exchange for their assistance in dealing with the USNA defectors (actually possessed by Parasites).
- Older Than She Looks: She is in her forties but looks younger.
Great Asian Union
Gongjin Zhou
Gongjin Zhou
- Voiced by: Koji Yusa
- Big Bad: The main antagonist of the series.
- Named After Somebody Famous: Has the same name as Zhou Yu Gong Jin, an admiral of the Wu country in Romance of the Three Kingdoms. Known as Shuu Yu in Japan.
- Revenge: He wants to destroy the Yotsuba clan because they destroyed his country.
- Stealth Expert: Knows the Ghost Walker magic.
Gonghu Lu
Gonghu Lu
- Voiced by: Takahiro Fujiwara
- Animal Motifs: Tiger.
- Fandom Rivalry: In-Universe with Naotsugu's fans.
- Made of Iron: Very durable even without his Steel Qigong.
- Red Baron: The Devouring Tiger.