Boro

is an Inner from the organisation Kara.

Appearance
Boro is a tall, heavily-built man with a beard and moustache. He has a trio of tattoos on his face that appear to form the Roman numeral Ⅲ.

Abilities
Being an Inner of Kara, Boro is regarded as completely monstrous in terms of power, as well as in some way worse than Jigen. He apparently has access to Space–Time Ninjutsu, having been alone inside a separate dimension.

Ao Arc
Boro attended a meeting held by Jigen to discuss the urgent situation relating to the missing "vessel". As Jigen dispelled the genjutsu, he voiced that they must recover the vessel at all costs.

Kawaki Arc
Figuring Delta would be disheartened following her failed attempt at retrieving Kawaki, Boro laughed at her when she became frustrated. Shortly after, when he was informed Koji Kashin was observing Kawaki in Konohagakure, Boro questioned what the Inner was doing. Some time later, after Jigen has sealed Naruto Uzumaki in a tea pot in a foreign dimension, Boro watched over it. Shorty after, a group of children came into his vicinity, leading to Boro joyfully recognising Kawaki.