Luna

Ruka, or Luca (see below), along with her twin brother Rua, aid Yusei Fudo, whom they adore and support in his duels while making fun of fate. Ruka is calm and collected. Ruka is a Signer and is the owner of the Claw Dragon birthmark.

Ruka gets tired right after a duel. She also has the ability to communicate with duel monsters. Much to her brother's irritation, she tends to candidly point out the various flaws in Rua's plans and flatly insult him.

Characters biography
Ruka lives together with Rua in the Tops resident area. They spend most of their time alone together as their parents are usually at work. They are educated via the internet, so they spend most of their time inside.

Ruka was selected as someone to participate in the Fortune Cup. Not feeling like participating, Rua planned to disguise himself as her and participate.

Ruka was able to sense Yusei when he was shocked by the police officers. Ruka and Rua rescued him after his duel with Ushio and take him to their home. Yusei wants to leave feeling like he's putting them in danger. But Rua talks him into a Duel. After Yusei wins, Ruka and Rua manage to get him to stay for the night.

Rua and Ruka awake the next morning to find that Yusei had left after modifying their Duel Disks to fit their small arms.

The next day, Rua enters the Fortune Cup in disguise as Ruka, but using Akutsu's Signer-detecting technology, Jeager is able to not only determine that Bommer dueled Rua instead of Ruka, but that Ruka is a Signer.

Ruka faces off against Professor Frank due to Rex Godwin's consolation game. In the middle of the duel, both her and Rua are hypnotized.

Naming


Linework by Kazuki Takahashi has revealed the names of Rua and Ruka to be as such. A possible misinterpation of the writers of the anime, due to common confusion between "L" and "R" has revealed the names to be Lua and Luca

Deck
Ruka plays a Deck consists of LIGHT monsters. Most of her monsters have fairy-like appearances, although not all of them are Fairy-Types.