Eiki Fūma

is an Academy student and a member of the Fūma clan in Konohagakure. His father serves as a Tokubetsu Jōnin on the Konoha Military Police Force.

Personality
Eiki is a very serious boy, eager to excel in his goals as a ninja. While very proper in his way of talking, taking pride in coming from a famous clan, he can be overconfident in his abilities and ultimately reckless. He has a crush on Kae Yukiwari, gets nervous when interacting with her, and gets jealous of other boys getting closer to her than him. Despite his self-important attitude, he was remorseful when his efforts to expose Kawaki as a shinobi ended up damaging the stage the rest of his class built. He is very brave, taking upon himself to investigate a terrorist threat, and staying behind to limit the potential size of an explosion.

Appearance
Eiki is a fair-skinned boy of average height. He has amber eyes and dull grey hair that is buzzed on the bottom and parts to reach his ears on the top. He wears a black, long-sleeved shirt with a grey vest over it that has 3 downward-facing, yellow triangles lined up as one big triangle, and dark blue pants with black ninja sandals.

Abilities
Descending from the Fūma Clan, Eiki is noted to have great talent for ninjutsu. He has shown capable skill with Shurikenjutsu, able to hit the target with multiple kunai thrown at once. He also had adept chakra control, as he was one of the quickest in his class to master the Tree Climbing Practice.

Kawaki & Himawari Academy Arc
Upon starting at the Academy, Eiki quickly states his goals on becoming a ninja, making a good impression on everyone. When he dropped his handkerchief, Kae returned it to him, and he developed a crush on her. When Kawaki, older than any other student in the class, tried to befriend her, Eiki found him suspicious and was jealous. He attempted to force a spar against Kawaki, but he nonchalantly dodged all of Eiki's attacks. While having his injuries tended to, Eiki overheard the teachers talking about the tools storage room, and sneaked in, taking a summoning scroll. When he found Kawaki talking to Kae in a secluded spot, he attacked Kawaki with the summon, but was knocked unconscious by the summon, with whom he had no contract. Kawaki defeated it, and he and Kae left him there, certain he'd wake up with no lasting damage.

Without proper recollection of what happened, he continued to distrust Kawaki. He attended Kae's tea party, where he continued to voice his suspicion of Kawaki, even more so upon his awkward answers to questions. When Kae served the cake she made, Kawaki rushed to stop her from eating it, knocking tables over, and covering Eiki in cake. He began hurling plates at Kawaki in retaliation until Kae told them both to stop. Eiki later called out Osuka on her overbearing mocking of Kae. When Kawaki and Himawari exposed Osaka as having forced Neon to go along in lacing the cake with mustard as a prank, Kae dropped her composed attitude to reprimand her for it. When she tried to recompose herself, Eiki and the others were pleased with her genuine attitude. The party resumed, with Kawaki bringing everyone taiyaki. Days later, Eiki listened as some of his class-mates reported their experience with investigating the Academy's Seven Mysteries at night, doubting their veracity in an age of Scientific Ninja Tools.

Later, Eiki was put on a practice team with Neon and Suzu Sōgi to prepare the class for eventually team-ups. While dismayed that he couldn't be teamed with Kae, he was eager to show-off his skills during a series of competitions. Likewise, he built up a rivalry with Osuka. During the first competition, he quickly led his team to gather the most flags in a Tree Climbing Practice relay race.

When his class put on a play about the Sannin, Eiki was cast as Jiraiya, and to better understand him, he secretly read a book of the Icha Icha series. However, Sōsha discovered it and ran a story about it on the school paper, embarrassing him. Eiki received an anonymous note claiming Kawaki was an actual shinobi, with a secret that would get him expelled. Eiki confirmed it when he saw Kawaki's real forehead protector, and approached Sōsha to write a story on it. She wanted proof before running it, so he switched roles with Ehō, who was playing Manda. During a rehearsal, Eiki tackled Kawaki, who was playing Katsuyu, to grab his forehead protector. During the struggle, Osuka, who had overheard him and Sōsha, switched it for a prop one, causing Sōsha to accuse him of wanting her to publish a fake story. With much of the stage destroyed, Eiki felt bad about ruining things for everyone, and help repair it. Later, Eiki apologised again in private, and showed Kawaki the note he received, now believing it to have been a bad-taste prank.

The day of the festival, Eiki resumed his role of Jiraiya in the play, and vowed to make up for his previous behaviour. When the festival suffered a terrorist threat, Eiki and Ehō decided to help investigating, and discovered a hidden circuit with several explosive tags behind a building. Eiki stayed behind to disarm as much as he could, while Ehō went back to warn their classmates. Kawaki arrived in time to remove the largest explosive tag, which had already began burning, and used a shadow clone to take it as high as he could, where it exploded without hurting anyone.

Later, Eiki helped Himawari and Kawaki in trying to find the assassin's identity. After talking with his uncle Kōtarō, Eiki and the others decided to try and find the assassin before the attack took place by looking over several pictures taken by Sōsha. Eiki lied about falling in love with a mysterious woman in order to have Sōsha cooperate, much to his embarassment, but this allowed Sōsha to let them borrow her pictures. After looking over her photos, the trio saw Kae's butler Batora in the background of one of the pictures, and assumed Batora was the assassin. Kawaki and Himawari quickly made their way towards while Eiki was left behind. After the assassin was stopped, Eiki voiced his anger at Kawaki and Himawari for leaving him behind like that. Then, his fears came true as Sōsha published a story about Eiki's love for Icha Icha turning him into a playboy, much to his humiliation.

Trivia

 * Depending on how it's written, Eiki's name can have the following meanings:
 * As 英気, it can mean "great wisdom", "excellent disposition", "strength (to face something)".
 * As 盈虧, it refers to the phases of the moon, waxing and waning.
 * As 鋭気, it can mean "courage" and "high spirits".