Sumire Kakei

, born, is an Academy student from Konohagakure, and a representative of her Academy class. Later, she is revealed to be the mastermind behind the Nue|Ghost incidents, making her the main antagonist of the Academy Arc of Boruto series.

Background
Sumire's parents were a caring mother, and a driven father, Tanuki, who worked for Root. From a young age, she was trained intensely by her father to "avenge" Danzō Shimura for being betrayed by Konohagakure. Eventually, he bestowed her with the Gozu-Tennō in the event that he should fall before the goal was completed. After her parents died from the attack on the village by Kaguya Ōtsutsuki, Sumirei grew up as an orphan. Deciding it was best to wait and build up a cover story before exacting her father's plan, Sumire created the identity of "Sumire Kakai", becoming a class rep at the academy.

Personality
To all those who know her, Sumire is a rather meek and quiet girl who, like many children her age, adores the Seventh Hokage. While not very outspoken, she shows genuine concern for her classmates. Sumire is also very respectful and dutiful, and wishes to avoid conflict if necessary. Her reason for wanting to become a shinobi is to live up to her father's memory.

However, much of this was revealed to be a ruse. Having been training arduously by her father from a young age to complete his mission, Sumire is a driven young girl who's only goal is to complete the final request of her father. To which she shows no remorse for the people of the village she hurt. When confronted about this by Boruto, she brushed it off as saying the Sumire he knew never existed.

Appearance
Sumire is a young girl with purple-coloured eyes and hair, the back of which is tied into two long braided ponytails. Her hair frames her face and her bangs hang just above her eyes. She dons a black t-shirt, with a violet dress over it that has a white collar on it, knotted by a purple ribbon, almost resembling a seifuku overall with long black stockings.

At some point, her father Tanuki placed the formula for the Gozu-Tennō on her back.

Abilities
Having been trained intensely by her father since a young age, Sumire is a very skilled kunoichi, commented by elite ninja in Konohagakure. She was able to skillfully evade the combined assault and pursuit of her fellow classmates. She also showed considerable skill in melee-combat, able to counter Mitsuki's assault and land a blow with her kunai. Foremost, Sumire is a skilled actress and manipulate, having effectively portrayed herself as a meek and untalented young girl while continuing her mission.

Thanks to her father passing on the Gozu-Tennō to her, she is able to summon and control the dangerous Nue.

Academy Arc
On the day of the entrance ceremony, as everyone began looking for an absent Boruto, he suddenly appeared, crashing a train into the Hokage Monument, which left Sumire amazed at his antics. Shikamaru then had everyone clear out to begin clean-up. Two weeks later, after Boruto's suspension ended and he finally joined the class, he quickly began making another spectacle of himself, amazing Sumire by his consistent nature to stand out. Chōchō Akimichi however noted that it was only because he keeps getting into trouble. Sumire tried to settle things down when Inojin Yamanaka began speaking out. Later, Boruto got into a confrontation with the class' top student Iwabee Yuino. As two students began arguing about what it means to be shinobi, they decided to skip class to settle things in fight. Despite her concern about class, Sumire joined the rest of the class to watch the fight in a training arena. During the fight, Sumire noted that Boruto really seems to be striving to make a name for himself outside his relationship to the Seventh Hokage. Ultimately, Boruto and Inojin's respective words resonated with Iwabee, ending the fight. Despite the pleasant ending, Sumire and the rest of the class were fiercely scolded later by sensei Anko Mitarashi for skipping class. The following day, Sumire is relieved to see Boruto getting along better with everyone. Chōchō teases Sumire about her concern for Boruto, to which an embarrassed Sumire insists it is purely from her status as class rep.

Weeks later, as class started learning shurikenjutsu, Sumire was upset that her own performance wasn't showing much progress. Eventually, Boruto Uzumaki's reckless fun with a fūma shuriken caused some property damage. Their teacher Shino Aburame decided to have Boruto, along with a bunch of other students help with repairs to the Hokage Rock, although he insisted that Sumire's part would mainly be supervision. Later, as the group neared completing their work, an anxious Metal Lee got too worked up and caused more damage. Afterwards, realising that Lee suffered from social anxiety, Shikadai commented on it, insisting that he get over it. As Lee walked away shamed, Sumire felt bad for him, noting that he easily works harder than anyone else in their class.

During a class introducing students to summoning techniques, Boruto got into an argument with Sarada, which caused all the boys to argue with the girls, to which Konohamaru broke up the squabble. Later during their lunch break, Boruto began to fight with Sarada over who would get the last yakisoba bun. Shino appeared, insisting that they boys and girls settle things with a race challenge for a flag. The challenge quickly got heated up, causing much property damage, leading Sumire on getting the flag and winning for the girls. Despite their victory, the girls made peace with the boys.

Later, the class gained a new transfer student from Otogakure named Mitsuki. Wanting the students to warm up to Mitsuki, Shino organised a welcoming party for the new student. Sumire was amazed at the effort of the stoic Shino, who explained to the class rep that he struggled making friends growing up due to his loner nature and wanted to make sure his students don't have the same problem. Ultimately, Shino's efforts for the party backfired with his insects, the class began to freak out, with Denki begging someone to make the insects go away, which Mitsuki did with his Wind Release: Breakthrough, causing even more damage to the Academy.

Later, Sumire realises that she is being stalked. Eventually, she and her friends discover that it is Magire, a shy student from a different class. When Magire meekly asks her out, Sumire turned him down, leaving him distraught and running away in shame. The following day, to Sumire's horror, various creepy messages are left for her. Eventually, she is confronted by the perpetrator, revealed to be a possessed Magire, who kidnaps her. When her friends found them, Magire quickly attacked them with his concealment skills. Eventually, Chōchō was able to reach Magire, noting that such an indecisive nature will never win anyone over. Accepting his poor methods of trying to make Sumire like him, the spectre was rejected from Magire. As Magire began to apologise for his actions he fainted, resulting from severe chakra drain caused from his possession. While the others quickly took him to the hospital, Sumire checks on Boruto, who was acting strange as he was the only one who was able to see the truth behind Magire's strange actions.

Later, the class was assigned by Shino to split into groups of three and each tail a different workplace for a few days to better understand non-shinobi life. Sumire suggested her group go to the Water Purification Plant. On the second day, the Sumire unleashed the Nue on the feigning being a victim. She was ultimately "saved" by the Hokage, who took Sumire and her fellow injured classmates to the hospital. Her friends and teacher soon afterwards went to check on her. Later, Sumire watched solemnly as her injured classmates were relieved from care early and left with their respective parents.

Later, realizing that her identity was found out, Sumire left the hospital, having feigned injuries, and decided to complete her mission. She was ultimately ambushed by Sai Yamanaka and his team. While initially subdue, she summoned the Nue to rampage the village. As she slipped away, she was confronted by Mitsuki, who noted his mission to kill her. As the two began fighting, Boruto arrived, demanding answers. Sumire bluntly stated that her entire existence has always been for revenge. As Boruto intervened in another clash between his two friends, his eye began to act wildly. Nue then teleported above the children. Sumire calmly offered herself as the necessary chakra to complete its development, which the creature consumed her whole.

Trivia

 * means violet, fitting her colour scheme, as well as her shy personality.