Itto Fukunaga

Itto is Koji's best friend in Five.

He recently started working as a cop trainee in a task force under Eisuke's command, causing him to get involved into the Phantom Thief case.

Deck
Itto runs a Watercraft Deck, featuring WATER Fish Main Deck Monsters and WATER Machine Extra Deck Monsters - all based on watercrafts. His Deck's design mirrors Koji's - which's composed of WIND Beasts and WIND Machines - also featuring Metalmorph-themed cards (he Metalmorphs through Traps though, in contrast to Koji's Metalmorph Spells).

His strategy consists of manipulating "Torrential" Trap Cards without actually Setting them to control the field and inflict effect damage, so that they can't be sealed or destroyed by the opponent.