Luna, known as
Ruka in the Japanese version, sometimes romanized as
Luca,
Luka, or
Ruca, (see
below), is
Leo's fraternal twin sister and a
Signer who possessed the front claw
Mark of the Dragon. She and Leo aid
Yusei Fudo, whom they admire and support, in his Duels. Luna is the younger, frail, calmer, more collected of the twins. Luna tends to get tired right after a Duel. She has the ability to communicate with Duel Monsters after having spent ample time with Duel Spirits in a different dimension during a coma. She and her brother also have vignette series before each episode in the
Dark Signers arc known as
card of the week.
Ancient Fairy Dragon
Ancient Fairy Dragon is a
Duel Monster Spirit, who is one of the servants of the
Crimson Dragon, often referred to as the
Signer Dragons.
Luna is the
Signer associated with Ancient Fairy Dragon. The "
Ancient Fairy Dragon" card was in possession of the
Dark Signers, until Luna defeated
Devack with
Leo's help and claimed the card back. The only other humans that have come in to contact with her are
Jack Atlas,
Tetsu Trudge,
Yusei Fudo and
Leo.