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Voiced by: Mutsumi Tamura (JP), Aaron Dismuke (EN)
A kindhearted, yet sophisticated teenage boy. Kio is easily able to accept the proof that his new friend is an alien, and that both his other friends are secret agents. He knows how to handle firearms, though he is not sure what business his Uncle Yuichi is in to have them. He displays a strong sense of justice, and is willing to take action when he feels it is needed. This sense, and his treatment of others, draws the attention of his female friends. He is unsure about his reaction to all that interest, and their attention begins to cause complications for Kio. Eris the Catian in particular has decided that she wishes to be his mate as she is about to come into her first heat
Voiced by: Kanae Ito (JP), Tia Ballard (EN)
A 16-year-old scout for the Catian people exploring Earth. Tall and well endowed, she has easily befriended many people, and regular cats she has met on Earth. Initially most do not believe her to be an alien, but she shows Kio the proof directly with her technology, ears and tail. While she is learning the ways of Earth, she is also a competent fighter who employs strategies and technologies not seen on Earth. Her interactions with Kio are closer and more emotional, potentially due to the fact she is 16 and about to enter her first heat. With the kindness and interest he has shown, she has selected him as a mate. Her first heat was forcibly ended by pills as it was causing disruption to her duties as an ambassador and representative of Catians on Earth. She develops feelings for Kio after she found out he risked his life to save her when she was captured
- Buxom Is Better
- Gainax Bounce
- Genki Girl
- Leotard of Power
- New Transfer Student
- Rapunzel Hair
- Red Eyes, Take Warning: A nicer version.
- Zettai Ryouiki
- Awesome By Analysis
- An Axe to Grind: In the manga and light novel
- Badass Adorable
- Blade on a Stick: In the anime
- Blood on These Hands
- Cool Car: Her Ford Shelby GT500, outfitted with defensive "spy car" gadgets.
- Cursed with Awesome: She tells Manami that she has the ability to teleport objects within 50 meters to her. But apparently this ability caused her parents to abandon her.
- Cute Bruiser: Especially when she's wearing her suit, or later, Ichika's scrolls.
- Dual-Wielding: In the manga and light novel
- First Kiss: Kisses Kio first during the Now or Never Kiss
- Gun Slinger
- Green Eyes
- Half-Human Hybrid: maybe. Her sister is, but Aoi may just be a mutant.
- Hyperspace Arsenal: Justified with her ability to warp any object within 50 meters
- Improbable Aiming Skills
- Name's the Same: with the Wholesome Crossdresser from You're Under Arrest
- Rapunzel Hair
- Senseless Violins: In Episode three.
- Clingy Jealous Girl
- Curtains Match the Window
- Gainax Bounce
- Groin Attack
- Patient Childhood Love Interest
- Pervert Revenge Mode: She can skirt the line between this and Unprovoked Pervert Payback when Kio sees her in unfortunate positions. Really, beating the guy up for walking into his own living room? Or coming running to help you after hearing gunfire in a public street?
Voiced by: Kikuko Inoue (JP), Staci Moon (EN)
Voiced by: Aki Toyosaki (JP), Lara Woodhull (EN)
- Older Than They Look: The Light Novels reveal that she has three children of her own, and was childhood friends with Captain Kuune.
- Petite Pride
- You Gotta Have Blue Hair
A Dogisian in charge of the underground relations between her home planet and governments through Earth. After knowing about the arrival of Catians on the planet, she devises schemes to prevent establishment of official diplomatic relations between them, including trying to eliminate Eris and her friends.
- Big Bad
- Hey, It's That Voice!: Her English voice reminds you of a certain trigger happy alchemist, a pirate made of rubber and a sexy yet deadly vampire.
A sergeant to the Dogisia military and a younger sister to Jens. She was brought in by Nilemia to take Jens place. She is the inventor of the active chart system to predict the future.
An ensign and a superior to Leunne. Having a senator within the Balum world government as her father she had become spoiled and manupulative to obtain what ever she wants.
Voiced by: Hironori Kondo (JP), Jason Douglas (EN)
Jens's personal dog-like assist-a-roid.
The first Catian Assist-a-roid.
Voiced by: Ayahi Takagaki (JP), Lindsay Seidel (EN)
- Catgirl: She is an immortal catgirl sage created hundreds of years ago on Earth with magic.
Voiced by: Yukiko Monden (JP), Jamie Marchi (EN)
Despite the name, JACK is actually a woman. Her real name is: Janis Alectos Carotenas Karinato. She works for the CIA and is acting supervisor of Manami. She has noticeably long blond hair, is barely dressed and is often seen eating fast food, appearing to the stereotype of American women.
Voiced by: Hiromi Hirata (JP), Martha Harms (EN)
Kio's teacher and leader of Beautiful Contact Japan Sect. Due to the fact Elis doesn't represent the stereotypical alien (tentacles, green skin, etc), she firmly believes that Eris, despite the obvious, is not really an alien.
Antonia Lirimonie Norfedras Papanorgas Arecroteles Cnorses Morfenoss is a wealthy 12 year old, leader of the Underside of Kitten Paw cult and rarely seen without wearing a pair of cat ears. She grows attached to Kio in the last episode due to him becoming a cat boy.
Voiced by: Akeno Watanabe (JP), Clarine Harp (EN)
Voiced by: Sayori Ishizuka (JP), Kristi Kang (EN)
Alicia Maria Yorkshire
AKA Black Amaryllis, an agent working for the British SIS. Comes from a former British aristocrat family at the age of 16. Born with a heart defect she had gone through a heart reconfiguration surgery that gave her super human abilities.