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Luna
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'''Luna''', known as '''Ruka''' or '''Luca''' (see [[#Naming|below]]) in the Japanese version, along with her twin brother [[Leo]], aid [[Yusei Fudo]], whom they adore and support, in his Duels. Luna is the frail, calmer, more collected of the twins. She is a [[Signers|Signer]] and owner of the rear claw [[Mark of the Dragon|mark]].
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. Much to her brother Leo's irritation, she tends to candidly point out the various flaws in his plans and flatly insult him, but does deeply care for her brother.
==Design==
