Dark Yuki

Dark Yuki (闇ユウキ, Yami Yūki) is a physical manifestation of Yuki Jojima's darker emotions as well as the eleventh Horoscopes, the Gemini Zodiarts (ジェミニ・ゾディアーツ, Jemini Zodiātsu), who had evolved past the Volpecula Zodiarts form.

Appearance
Identical to Yuki to every way, the only physical difference between the two is that Dark Yuki normally wore a white expressionless mask on her face. However, when she starts to become the dominant aspect, Dark Yuki is able to discard the mask until Yuki regains herself.

Personality
As the embodiment of Yuki's inner darkness, Dark Yuki is sadistic and calculating and acts on her other self's evil desires. She also has a desire to replace the Yuki in order to become more real.

Abilities
In her human form, as she becomes the dominant Yuki, Dark Yuki siphoned the original's traits and knowledge. As the Gemini Zodiarts, not only does she possess a very unorthodox fighting style, she is armed with several playing cards that function as explosives: red cards known as Lynceus (リュンケウス, Ryunkeus) that explode on contact and blue cards called Idas (イーダス, Īdasu) that are remote explosives that explode when she snaps her fingers.

Her Supernova ability allows the Gemini Zodiarts to produce a clone of herself that doubles as a living explosive.

History
Dark Yuki came into being when the Leo and Libra Zodiarts forced Yuki to activate a Zodiarts Switch. Due to the nature of the Gemini Switch, only the dark aspects of her personality congregated into the newly created Dark Yuki. Dark Yuki would then go on to do the things Yuki could only dream of: Cheating Kengo out of a chance to see NASA, vandalize school property with space theme, and pushing Miu to a five foot drop. Kamen Rider Club thought Yuki snapped until they found footage of Dark Yuki. The matter gets worse when it is revealed that Dark Yuki is becoming more real every minute while the real Yuki is begining to cease to be, taking over Yuki's life and tricking the Kamen Rider Club to attack their now-masked friend.

With the original Yuki becoming less and less dominate, Dark Yuki began the ceremony of death and rebirth where Yuki would disappear forever. However, when Gentaro shows the ticket Yuki gave him to go to space with her when Gentaro moved away, Yuki regained her face and Dark Yuki lost dominance. Enraged, Dark Yuki became the Gemini Zodiarts. While initially having an advantage over Fourze, the Rider used the Meteor Storm Switch to absorb the Cosmic Energy of the Gemini's Supernova technique and one of her red cards, and later destroyed Dark Yuki with the Rider Super Galaxy Finish. Her Horoscopes Switch was retrieved by Leo.

Etymology
An alternate romanization of Yuki Joujima's name is "Yūki Jōsima", which is an anagram of "I am Sōjikyū". Sōjikyū (双児宮) is the term for "Gemini" in Japanese astrology.