Kaze

Yamikawa is a character in Yu-Gi-Oh! ZEXAL. He is a former student of Rokujuro's Duel Lodge, as well as one of the Number holders.

Past
In the past, Yamikawa was a student at Rokujuro's Duel Lodge, but after dueling him and losing his faith, he grabbed a sword and slashed a statue of Armored Ninja Blade Heart, cutting it in half, after which he left the Duel Lodge and hadn't been seen since.

Present
After Yuma Tsukumo and his friends went to the Duel Lodge to help Rokujuro out, Yamikawa showed up again and challenged his former master to a duel, to which he easily won. He then ran inside and went to finish what he had previously done, cutting the Duel Statues up, but was stopped by Yuma Tsukumo who challenged him to a Duel. As the Duel progressed, both continued to overthrow each others strategies and it was revealed that all of Yamikawa's hatred caused him to become possessed by a Number card, or to be specific "Number 12: Armed Ninja - Crimson Shadow", but he ultimately lost when Yuma Summoned "Number 39: Utopia" and defeated his Number. He then went to slash the statue again, but was stopped by Yuma who convinced him that it was wrong, to which he apologized and began to study at the Duel Lodge again.

Decks
Yamikawa uses an Armored Ninja Deck capable of quick Xyz Summoning, spearheaded by "Number 12: Armed Ninja - Crimson Shadow". As a former disciple of Rokujuro, he also used a Statue Deck in Statue Duels. A flashback from episode 15 featured him losing to Rokujuro, but no cards were shown.