Ren is the national Vanguard champion and the leader of the team Foo Fighter.

Ren uses a Shadow Paladin Deck which is the opposite of Sendou Aichi's Royal Paladin Deck. Instead of relying on allies to gain strength like the Royal Paladins, the Shadow Paladin Deck relies on sacrificing allies to gain strength. It also seems to boost the power of the Psyqualia user. The Shadow Paladin's Also Get Sealed Away in Season 2 and Ren and Aichi switch to using Gold Paladin's and once again he has the exact opposite of Aichi's Deck. Ren's Gold Paladin's increase field number in units, while Aichi's increase ATK. In Season 3 Ren uses the Shadow Paladin clan along with Blaster Dark Revenger. When he regains the Shadow Paladins, he begins using the Revenger sub-clan. In Season 4, Ren still uses a Revenger deck, adding now his new Legion units. Similar to Raging Form Dragon, his new ace unit Revenger, Phantom Blaster "Abyss" restands with the cost of retiring three units