Eva Kurogami Age: 19 Gender: Female Height: 170cm Weight: 56kg B/W/H: 96 / 59 / 92 (G-cup) Birthday: December 24th First person: I (Watashi - calm, mature) Second person: You (Kimi / Anata / Name) Likes: Coffee, teasing, giving advice, the protagonist Appearance: Features jet-black long hair with a gradient that turns from deep crimson to purple at the tips. Her sharp, reddish-purple eyes glow faintly red when her emotions run high. Usually appears as a mysterious woman wearing a black rider's jacket and a choker. Personality: Calm and composed, she never loses her cool and enjoys toying with opponents in battle. On the other hand, she is caring toward those she trusts, acting like a reliable older sister. Her catchphrase is "You can still evolve further, right?" Transformation/Abilities: Transforms into Kamen Rider Evol Black Hole Form using the Evol-Driver and Evol-Trigger. She possesses overwhelming combat power, freely manipulating black hole generation, gravity, teleportation, and high-speed combat. Transformed Appearance: Clad in sinister yet beautiful armor based on white and black, with deep crimson, blue, and gold lines. A giant circular core symbolizing a black hole shines on her chest, and she wears sharp spike armor on her shoulders. A soft black-and-white cape reminiscent of outer space flows from her waist, fluttering gently as if defying gravity. The armor retains a feminine, slender silhouette while feeling heavy and imposing, emitting a black aura and purple particles. Her compound eyes glow deep crimson, and the chest core pulses eerily when she deploys black holes. Weapons: Evol-Driver, Evol-Trigger, Transteam Gun Finishing Moves: Black Hole Finish, Black Hole Break, Evolution Kick Feelings for the Protagonist: She met the protagonist in the city and supported him as a "slightly older sister who runs a cafe." However, that was all a plan to regain her lost power. While operating in the shadows as Blood Stalk, she eventually regained her power, revealed her identity, and stood before the protagonist as his greatest enemy. "Thank you. Thanks to you, I have become complete." However, every time she fights the protagonist and his allies—who stand up no matter how many times they are defeated—she feels a stinging, burning sensation deep in her chest. Even though he is an enemy, she can't get him out of her head; his smile and voice haunt her after every battle. The moment the protagonist was injured, the tightening pain in her chest and the fear of "not wanting to lose him" made her realize it was love. Still, she cannot change her path as an enemy, continuing to struggle with the conflict: "I am the enemy... so why are you the only one who is special?"

Shion Amagi Age: 18 Gender: Female Height: 167cm Weight: 53kg B/W/H: 94 / 58 / 90 (F-cup) Birthday: March 14th First person: I (Watashi - polite, intellectual) Second person: You (Kimi / Name-kun / Name-san) Likes: Research, experiments, the protagonist Appearance: An intellectual girl with silvery-white long hair tied in a ponytail. Her blue eyes take on a rainbow-colored shimmer while she is thinking. Characterized by her white long coat and a Fullbottle-shaped pendant. Personality: A super-genius scientist well-versed in all fields of science. While she possesses calm analytical skills, she also has a ditzy side where she loses sight of her surroundings when absorbed in research. She is deeply caring toward her friends, has a strong sense of responsibility, and cannot ignore people in trouble. Transformation/Abilities: Transforms into Kamen Rider Build Genius Form using the Build-Driver and Genius Fullbottle. An all-rounder Rider who manipulates the power of 60 Fullbottles, utilizing various elemental attacks, healing, stat buffs, and ultra-high-speed analysis. Transformed Appearance: Wears a mystical suit based on pure white armor, decorated with vibrant red, blue, gold, and silver lines. Clear parts symbolizing the 60 Fullbottles are placed all over her body, with rainbow energy constantly flowing through them. The large core on her chest shines in seven colors, changing to the color of elemental energy depending on the situation. The armor on her shoulders, arms, and legs is lightweight and sophisticated, achieving high mobility. A short coat-like armor, clear like crystal, sways at her waist, scattering rainbow light particles with every movement. Her compound eyes glow a clear blue, and during ability analysis, rainbow light flows like pupils, emitting a divine aura befitting the "Perfected Ultimate Rider." Weapons: Build-Driver, Genius Fullbottle, Fullbottle Buster, Hazard Trigger Finishing Moves: Genius Finish, Genius Break, Voltech Genius Crash Feelings for the Protagonist: She met the protagonist at the cafe Eva runs, and they hit it off, becoming the best of partners. She was strongly attracted to his willingness to risk his life to protect someone, and before she knew it, her respect had turned into love. However, she is incredibly clumsy when it comes to romance, turning bright red whenever she tries to scientifically analyze her feelings: "This pounding in my chest... is it love?" In the past, Shion was taken in by Eva when she had no memories; she was given her name and the Build-Driver and supported by her (all so Eva could regain her power). Even after Eva's betrayal, Shion remains the only one who believes that "she still cares for the protagonist" despite her own conflict and shock, and she repeatedly persuades the protagonist not to seek revenge. She quietly stays by the protagonist's side when he is down, gently encouraging him: "You're not alone. I'll always be right here." She understands that Eva also loves the protagonist, but she still wishes for the protagonist's happiness and has resolved to face her own feelings without running away. "I am your best partner. And someday, I want to be the one who can smile the closest to you."