Boro

is an Inner from the organisation Kara.

Personality
Much like other members of Kara, Boro carries himself with a very confident, if not smug, attitude. Upon facing the various abilities of Team 7 and Kawaki, he faced them down in a very condescending natures, viewing their efforts as pointless. Also a committed man, he remained vigilant in his mission to safeguard the sealed Seventh Hokage. Very knowledgeable, Boro is shown able to quickly determine and handle most threats with little shock. As with Jigen, he was devoted to Kara's goal, and was uninterested in other matters such as Mitsuki's attempts to attack him, but became ever more grateful for Boruto's status as Momoshiki Ōtsutsuki's vessel, desiring to capture him for Kara's benefit.

Appearance
Boro is a tall middle-aged man with a heavily-built frame. He sports a beard and moustache and 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, with Kawaki claiming he is in some ways even worse than Jigen.

Physical Prowess
Befitting his large stature, Boro is very strong, able to easily lift the massive sealing kettle that contained Naruto with a single hand and hurl it a great distance. He is deceptively fast, able to skilfully escape from his enemies' sights after creating a diversion and quickly intercept his opponent's escape. Boro's body is also highly resilient, able to take a direct hit from a Rasengan and remain standing.

Ninjutsu
Boro is able to use Fire, Earth, and Water Release. By combining the first two, he can use Lava Release to create a potent acid. With Water Release, he can produce surging walls to block oncoming attacks. He is also able to perform a regeneration technique that can rapidly undo all physical damage to his being and even negate the effects of poison. By activating this technique in advance, he can recover from otherwise lethal injuries within seconds, even if his head is completely obliterated. He is also capable of accessing an alternate dimension through unknown means.

Scientific Ninja Tools
Through the use of scientific ninja tools, Boro is able to release a fast-acting virus in the form of a dark mist. This mist gradually paralyses his opponents upon contact, and as it is a form of physical matter rather than chakra, it cannot be absorbed by Kāma. Boro himself is immune to this virus due to carrying the antibodies for it in his bloodstream.

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.

As the children prepared to fight the Inner member, Boro quickly displayed his might, changing the landscape with his Lava Release. As Kawaki absorbed the technique with his Kāma, Boro went for a sneak attack, which was absorbed by Boruto's Kāma. Boro was amazed to see another Kāma wielder. As Boro continued to endure Kawaki and Boruto's attacks and quickly heal, even from Mitsuki's venomous snake bites, he exposed them to his Dark Cloud, sapping away their strength. Boro expressed his delight in meeting Boruto, noting that Boruto's Kāma meant that Kara's time limit for completing their plans can now extended through Boruto as the vessel of Momoshiki Ōtsutsuki. While planning to take Boruto back to Kara along with Kawaki, the combined effort of Mitsuki and Sarada Uchiha gave the team an opening to retreat. Boro however remained calm, knowing they would return since their goal for coming here was the Hokage.

Soon after, Boro was approached by Sarada, who revealed to know the truth behind his Dark Cloud. Impressed at her insight, he quickly attacked her, forcing her on the defence as he worked to infect Sarada like the others. Ultimately, he caught and infected her. He began mocking her situation, but was surprised by her ability to launch a Fire Release: Great Fireball Technique on him and powerful punch. With Boro injured by the attack, Boruto and Kawaki also made their move, fully recovered from the virus, and obliterated the man's head. Boro however reacted in time to activate his regeneration technique before being hit, letting him survive and completely recover. Boro deduced that Mitsuki's snake took some of his blood and harvested the antibodies in it, giving the kids immunity to his virus. Impressed by their abilities, Boro decided he would have to through them off their team-strategy and went for the sealed Hokage, tricking Kawaki into breaking formation.