Koichi Kimura (木村輝一) is a Supporting Protagonist from Digimon Frontier. He/She is Koji Minamoto's Twin Sibling who lives with Yoshiko Tsushima & is her Partner when she transforms into Loweemon, JagerLoweemon & Rhihimon like him/her.As a Boy, he is voiced by Kenichi Suzumura, Crispin Freeman & Benjie Dorango. Later as a Girl, she's voiced by Mikako Komatsu, Amber Lee Connors & Steffi Graf Bontogon.
Koichi is a tomboy with pale skin, short navy hair that is parted to the sides of her face, blue eyes & G-Cup breast size similar to Stella's. She wears white hairband similar to Jun's, Koichi is mostly seen wearing pink & white striped bra & panties under Bonyari High School Uniform for girls which is a half-sleeved white shirt with a blue sailor-style collar attached at the lower part of her neck and it connects a thin orange tie that is laced through a loop at the end of the shirt, making a little part of the tie to reach the skirt. The skirt reaches around the upper thighs and is a blue fabric, that is accompanied by black thigh-high socks & brown loafers.
There is a relatively common misconception that Koichi is both lesbian & androgynous because of her clothes and delicate appearance, but Koichi is a girl:
- Koichi has referred to herself using the normally masculine pronoun ore (俺) multiple times.
- Her Butler Jolbert Riessfeld calls her Ms. Kimura (木村さん).
Strega (魔女): Koichi mainly attacks by gathering her prana to create breast & butt attacks. The image she uses when using her Strega abilities are martial arts which is because of an experience with Orphelia about them. She combines these with her huge breasts & butt, & later the Zangetsu, to great effect. Koichi begins her moves. During her duel with Nozomi Kaminashi, she is shown to use a move that begins, though it is unknown if it falls under the previous two categories or if it's a new category of its own.
- Butt Cannon (尻キャノン砲) The Strega Technique was firstly used by Koichi, Mai & Nozomi in the first test of the second exam, the "Penalty kick". The user performs a series of flips and midair spins to build up energy that is released through a melee attack through the buttocks. The attack extends the user's range slightly, being capable of striking more than all opponents.
- Vacuum Butt Cannon (真空烈尻) A stronger Strega Technique, capable of shredding the swimsuits & clothes of her opponents.
- BTB Attack (バストトゥバストアタック) The Strega Technique belongs to Mai Kawakami, Nozomi Kaminashi & a Female Koichi Kimura. It is used on the final test of the second exam. Where Erika is overwhelmed by her Love Rival, who is capable of targeting any weak points. As such, Erika decides to push her big bust very close to Julis'. While Erika is capable of stopping Julis' movement, she is also unable to move freely.
- Shadow Meteor Hip (影重力落下尻) This Strega Technique belongs to Mai Kawakami, Nozomi Kaminashi & a Female Koichi Kimura, who mastered it during the training camp. Koichi first uses this technique when she fights her opponents. Koichi firstly swings her buttocks to her opponent's face. They later think that Koichi is going to pull her buttocks back. However, Koichi stops her buttocks for a few seconds, before striking them down. Fully utilizing the weight of her buttocks. On the other hand, her opponent, who is unable to bear her buttocks' weight, will absolutely fall down.
Orga Lux: Koichi wields the Orga Lux Pan-Dora which allows her to see up to 300 seconds into the future. The cost is seeing nightmares depicting her own sacrifice every time she sleeps. It never shows her the same death twice but an array of different methods. She ironically refers to her Orga Lux as her "honey" and says it is the worst of all Orga Lux personality wise.
Genestellar (星脈世代): As a Genestellar, Koichi has enhanced physical ability and an aura known as prana.
- Koichi's gender is male, but goes by he/him pronouns. This leads many fans to speculate that Koichi is an androgynous.
- Koichi is Ranked 6th at Rewolf Black Institute.
- Fans of the show consider Koichi to be somewhat similar to Ken Ichijouji.
- Initially, during her introduction, Koichi was showed extremely manly, with no visible breasts. However, once her gender was out to the audience, she was given the biggest breasts much bigger than any other girl in the series as a sign of her feminine interior.
- As the story progresses, Koichi began to show her feminine side more than her masculine side.