Boro is a member of a Kara. He is a major antagonist in Boruto: Naruto Next Generations.
In his meeting with Kara, Boro is shown to be silent and willing to listen to Jigen as the latter gives his orders. Boro is also shown to take Delta’s anger lightly when she is mad and finds it amusing when she is enraged. When facing his enemies like Kawaki, Boruto, Sarada, and Mitsuki, Boro is shown to be arrogant given his demeanor and how he talks down to them. Boro is casual as he faces Kawaki and the other leaf ninja and does not show fear when he is outnumbered by them. Despite being children, Boro made it clear to his opponents that he was willing to kill them if they interfered with his plan.
In the past, Boro joined Kara and became an inner member within the organization. Boro also had a history with Kawaki – having witnessed and or participated in his abuse when the kid was younger. Because of the abuse, Kawaki escaped from Kara.
Boro first appears alongside the other Kara members when Jigen called them in to search for the missing vessel. Boro appears later alongside another Kara member, Code, where they both make fun of Delta when she lost in her battle against Naruto Uzumaki. He is also present when Delta told Jigen about Boruto who have a kama seal.
When Jigen successfully seals away Naruto and the Nine-tails within a container, Boro enters the dimension where Jigen fought against both Naruto and Sasuke. While in the dimension, Boro encounters Kawaki, Boruto, Sarada, and Mitsuki. Kawaki is not pleased to see him and the latter wants to retrieve the container that contains Naruto. Boro did not want them to retrieve the item and tells them that they have to be careful with the container because if it break the contents within it will spill out. Boro immediately gets into battle against Kawaki and the Leaf ninja. During the battle, he is surprised to see both Kawaki and Boruto absorb his attack and remark about their Kama seals. He then uses the mist jutsu to make it harder for Kawaki and Boruto to fight him. When Kawaki and Boruto was down, Boro intends to capture both of them until Mitsuki intervenes. Despite Mitsuki’s effort, Boro is able to knock him down and then threatens to kill him if he gets in the way. Sarada also intervenes in the fight to attack Boro by throwing a large rock at him. As the team escapes, Boro remarks how he knows they will return soon to try and rescue Naruto.