Rinji

is a shinobi who appears in the second Naruto Shippūden filler arc.

Character and Abilities
Rinji has sharp intellect and is a planning type. With this he is able to support Guren's mission. He's sincerely loyal to Guren, but he also seems to have a close relationship with Kabuto. He has the ability to use ultrasonic waves and he can control bats, allowing him to survey the surroundings and give battle instructions to his subordinates. He seems to fight Sakura in the later episodes.

Three-Tails Arrival Arc
Rinji became Guren's subordinate after the selection battle she and Kabuto held in Orochimaru's hideout. During his time in the hideout, he became comrades with his fellow subordinates Nurari, Kigiri and Kihō, often cooperating with them to win battles. He is sincerely loyal to Guren.