|Jafar says: Read my lips and come to grips with the reality!|
BackgroundTanuki Shigaraki trained her from a young age in order to avenge Danzo Shimura. Eventually, he bestowed her with Gozu Tenno. After the death of her parents, Sumire became an orphan and created the identity of "Sumire Kakei", deciding that it was better to wait and create a cover story before exacting her father's plan. Sumire eventually became the representative of her Academy class.
After Mitsuki found out the truth and informed Boruto and Shikadai Nara of this information, Sumire left Konoha hospital (after she previously faked getting injured) upon realizing that Konoha had found out her real identity. Later during a confrontation between her and Mitsuki, Boruto arrived demanding answers during which Nue showed up and transported the three children to an alternate dimension created by the Gozu Tenno. There Boruto is able to stop Mitsuki from killing Sumire, he is able to help her understand that her new identity is the real her, weakening the dark aura around her. As a result, when Nue refused to absorb her chakra and self-destruct afterwards to destroy Konoha, Boruto explains that Nue's affections shows it views Sumire as a parent, causing the Gozu Tenno to break causing the dimension to break after Boruto helps her understand of forging her own path, rather than following the path of revenge her father had forged for her.
Though this resulted in the dimension to begin to collapse, Sumire began to feel towards dying in the debris, she remembered her late mother's words she had forgotten about finding her own happiness instead of following in their footsteps. Thanks to Nue the three children were transported back to their world. After Sai and his unit arrived, as he was a former member of the Foundation himself, and could understand what she is going through, Sai offers to help Sumire rebuild her life which she accepts. Before leaving Boruto notices that a part of Nue is still connected to her, which she is happy with once she sees it.
Having gone through arduous training since a young age, Sumire is a very stealthy and capable kunoichi. Thanks to her link with the Gozu Tenno, she is able to summon Nue to assist her, and has shown to ability to create a snake-like mass of dark chakra. She has also shown a considerable skill in melee-combat, being able to fight on par with Mitsuki for a while. Her most powerful asset, however, is her deceptive and manipulative nature that has allowed her to forge herself a new identity, that of a meek and ordinary young girl. At the same time, she is very stealthy in general, able to effectively conceal her presence, making it very difficult to locate her.
- "Sumire" means violet.