Kyoka Jiro

Kyoka Jiro (耳郎響香) is a student at U.A. High School training to become a pro hero.

Appearance
Kyoka has short purple hair and asymmetric bangs. Her most notable feature is her plug-like earlobes which seem to be able to change length and control at will. Unlike the other students, she wears a vest over her school uniform.

Her costume consists of a black jacket, long peach-colored shirt, black pants, and boots with stereos in them. She also sports two small, red triangle facial marks just below her eyes, a plain black choker, and white finger-less gloves.

Personality
Kyoka has a pragmatic, unenthusiastic and rude personality which is shown a lot to those she finds irritating, in particular Denki Kaminari, who happens to be the most common target of her snarky comments. However, even though she usually displays a cold, indifferent attitude on the outside, she is also capable of exhibiting a more sensitive side, and can be very defensive and empathetic towards her friends. Additionally, she is afraid of horror-based activities and has an aversion to nudity.

Kyoka has a major interest in music (rock, in particular) and owns several instruments, which she is able to play to some extent. However, she appears to be somewhat embarrassed about her interests. Kyoka also seems to suffer from self-confidence issues in regards to her own body, most likely due to not being as physically developed as the rest of her female classmates.

Unforeseen Simulation Joint Arc
Kyoka is warped to the mountain area of the Unforeseen Simulation Joint along with Momo Yaoyorozu and Denki Kaminari. Annoyed that Denki is talking too much, she kicks him into one of the villains, causing the villain to be electrocuted by Denki's Electrification. She then uses her Quirk to protect Denki from an attack by one of the villains. Kyoka plugs her jacks into her boots to launch a sonic attack, causing the villains to block their ears in pain, which gives Momo the time needed to create an insulator sheet. Kyoka and Momo hide under the insulator sheet while Denki discharges a great amount of electricity, defeating the villains while Kyoka and Momo remain unharmed.

However, one of the villains takes an airheaded Denki hostage, forcing Kyoka and Momo to stop fighting back and remain motionless. Kyoka attempts a sneak attack by distracting the villain through conversation, but fails. Fortunately, the villain holding Denki is shot down by Snipe, freeing Denki, with Kyoka rushing to tie up the villain. She is then seen with her class after the battle with the Villain Alliance is over.

U.A. Sports Festival Arc
After Shota announces that the Sports Festival is approaching, Denki says that he plans to become a Pro's sidekick after he graduates, to which Kyoka states that many people become sidekicks and fail to become real Heroes, to which she thinks that Denki is the kind of person who would become like that, which causes Denki to become crestfallen. Kyoka competes in the Obstacle Race where she places 21st, allowing her to compete in the Human Cavalry Battle. In the Human Cavalry Battle, she teams up with Rikido Sato, Koji Koda, and Toru Hagakure while Toru is the rider. When the Human Cavalry Battle begins, Kyoka uses her Quirk to try and grab Izuku's headband like Tetsutetsu Tetsutetsu told her, but Fumikage uses his Dark Shadow to block her attack. Later in the Human Cavalry Battle, her team charges towards Shoto Todoroki's team, but her team gets zapped by Denki and frozen by Shoto's team. Her team fails to qualify to the next round when her team lost the Human Cavalry Battle.

After Denki and Minoru state that the girls must do the cheering battle as per orders from their homeroom teacher, Kyoka and the other girls of Class 1-A walk out in cheer leading outfits. However, as Kyoka and the girls walk out, they realize they have been tricked. Kyoka then calls Denki and Minoru idiots. During the recreational events, Kyoka is seen sitting still in her cheerleader outfit while watching Mina, Ochaco, Tsuyu, and Toru cheer lead. As the match between Ochaco and Katsuki begins, Kyoka comments that she might look away the entire time. During the match between Ochaco and Katsuki, Kyoka averts her eyes from the match when seeing Katsuki's explosion assault on Ochaco.

Kyoka along with her class watches the closing ceremony of U.A.'s Sports Festival.

Vs. Hero Killer Arc
Two days after the Sports Festival, Kyoka is in class. During the Hero Informatics period, Class 1-A has to decide on Hero names. Kyoka gives Denki an idea for his Hero name, causing Denki to reply that her idea was intellectual, horrified that she was complimented for her intelligence. Kyoka writes down and shows her Hero name to her classmates. Kyoka reveals her Hero name to be Earphone Jack, the Hearing Hero.

After Class 1-A have finished formulating their Hero names, Kyoka is given a list of 40 work places in order to choose a work place that she would like to train at. On the day of the work place training, Kyoka is at the train station with her class so that she can go to the work place of her choice by train.

She interns under Desutegoro. She later helps with a hostage situation.

The workplace training comes to an end and Kyoka returns to U.A.

After Foundational Hero Studies is finished, Kyoka is in the girls' locker room. Kyoka uses her earphone jacks to hear Minoru's plan to peek on the girls. Kyoka plugs one of her earphone jacks into the hole which stabs Minoru's eye, stopping Minoru from peeking. Kyoka wonders why she was the only one he did not mention.

Final Exams Arc
One week before the end of term test, Kyoka asks Momo to help her study. Throughout the final week before the end of term test, Kyoka studies under Momo's tutoring along with Denki, Mina, Mashirao and Hanta. On the day of the exercise test, Mr. Principal reveals that Class 1-A will be fighting against U.A.'s teachers for their exercise test. Kyoka is paired with Koji and they must face Present Mic in their exercise test.

Koji, Kyoka and Present Mic arrive in an uninhabited city where Class 1-A's test exercise will take place. In the city, Kyoka mocks Present Mic for what she takes as a poor reference, to which Present Mic tells her to be careful with what she says. Present Mic explains the 30-minute test; Kyoka and Koji must either handcuff him or one of them must escape the battlefield within 30 minutes in order to win and pass the test. The test begins.

Kyoka plugs in her Earphone Jacks to try and block out Present Mic's loud voice, but to no avail. Annoyed by Present Mic's loud voice, Kyoka tells Koji to command the nearby animals to attack but Koji is unable to due to Present Mic's voice making the animals wild and as a result, any command he gave would be useless.

Kyoka and Koji manage to get a little closer to the escape gate, but Kyoka notes that Present Mic will be at the escape gate and that no matter what option of victory they choose, a standoff is inevitable. Present Mic uses his loud voice again; Kyoka notes that they cannot get any closer as long as Present Mic is using his Quirk. Kyoka sees an ant and comes up with an idea; she asks Koji if he can control bugs but his terrified reaction indicates that he doesn't like bugs. Present Mic uses his loud voice once again; Kyoka tries to counteract with her Earphone Jacks' but the sound of her heartbeat does not do anything against Present Mic. Present Mic continues using his loud voice against Kyoka and Koji who are unable to handle it. Out of options, Kyoka asks Koji if he can control insects to which he approves. Kyoka uses her Earphone Jacks to break a rock which reveals dozens of insects, much to Koji's terror. Kyoka tells Koji that she understands his phobia but using the insects to attack Present Mic is the only plan she can think of because their opponent is too strong. Kyoka encourages Koji to follow through with her plan. After seeing Kyoka's bleeding ears, Koji is ashamed that he is running away from this fight and realizes that he can only continue being at U.A. by overcoming his fear. Koji musters up the courage and commands the insects to attack Present Mic. At the escape gate, Present Mic sees that time is nearly up. Suddenly, dozens of insects crawl on Present Mic, who realizes that the insects traveled to him by moving underground; a place where sound is ineffective. Present Mic is paralyzed by fear, allowing Koji to run through the escape gate while carrying an injured Kyoka with him; thus they pass the practical test.

Back at U.A. in class, Kyoka learns that she has passed the written test and will go along with her classmates to the forest lodge which is a boot camp. Kyoka accompanies her class to the Kiyashi Ward Shopping Mall to buy necessities for the forest lodge. At the shopping mall, Kyoka says that she requires a big carrying bag, to which Momo tells Kyoka that she will help her look for it.

School Trip Arc
The next day after the shopping trip, at U.A., Shota informs Class 1-A that the destination for their lodge trip has been changed and the new destination will only be announced on the day of the event. The first semester has come to a close and summer break has begun.

On the day of the event, Class 1-A boards a bus that will take them to the forest lodge destination. An hour later, Class 1-A's bus stops for a restroom break. However, Class 1-A notes that Class 1-B is not at the rest stop. Suddenly, two females wearing cat-like costumes and a small boy appear; the females excitedly introduce themselves as the professional Hero Team, The Pussycats. Mandalay explains to Class 1-A that they will be staying at the base of a mountain which is a part of their domain; they have three hours to reach the base of the mountain using their Quirks as they please and those who do not arrive there by 12:30 pm will not be served lunch. Soon, Class 1-A realize that they have already arrived at their destination and their training camp has already begun with The Pussycats being their supervisors. Some of Class 1-A try to leave, but Pixie-bob uses her Quirk to create a landslide of dirt that causes Class 1-A to fall into a forest called Forest of Magic Beasts, which they must traverse to reach their destination. Suddenly, Class 1-A are confronted by a beast; Koji tries using his Quirk to control the beast but it does not work due to the beast being made out of dirt. Izuku, Shoto, Tenya, and Katsuki mobilize and use their Quirks to destroy the dirt beast.

After Izuku, Tenya, Shoto, and Katsuki destroy the dirt beast, Class 1-A begins traversing the Forest of Magic Beasts. However, the journey through the forest to the Cabin takes around about 8 hours. Class 1-A arrive at the facility, battered and tired. It is now 5:20 pm in the evening. Pixie-bob admits that she thought they would take longer to get to the facility; she praises Class 1-A for figuring out her Earth Beasts quickly and easily. Class 1-A fetch their luggage from the bus and put it in their rooms. Class 1-A go to the dining hall to have dinner. After finishing eating dinner, Class 1-A go to the hot springs.

The next day at 5:30 AM, Class 1-A are outside the training camp cabin. Shota greets his students and tells them that they will undergo reinforcement training to strengthen and upgrade their Quirks which will also allow Class 1-A to obtain their temporary licenses.

During the night of the third day, the Vanguard Action Squad attacks the training camp, filling the forest with poisonous gas and fire. Momo runs into Yuga and asks him to take the unconscious Kyoka and Toru back to the facility. Near the Vanguard Action Squad's rendezvous point, Yuga hides behind a bush along with Kyoka and Tooru. Yuga contemplates on what to do because he was instructed by Momo to take the unconscious Kyoka and Tooru back to the facility, but Dabi and Twice’s presence are preventing him from doing that. Suddenly, Dabi spots the bush Yuga is hiding behind, much to Yuga's fear. Dabi prepares to go and check, however, he stops after Twice informs him that they must also call back Nomu since he only responds to Dabi. Yuga is relieved that Dabi did not discover him.

Hideout Raid Arc
After Katsuki is captured by the Vanguard Action Squad, Kyoka is taken to hospital in the hopes that she regains consciousness. Eventually, Kyoka regains consciousness, recovers and returns home. Shota and All Might visit her house and speak to her parents regarding relocating the U.A students to the dormitories. Kyoka's father is initially hesitant, but Kyoka tells Shota not to worry since her father has already agreed to send her to the dorms since he is actually happy that her daughter will become a powerful hero like All Might after witnessing his fight on TV.

Quirk and Abilities
Earphone Jack (イヤホンジャック): Kyoka's Quirk allows her to plug the jacks that hang from her earlobes into all sorts of things and channel the sound of her heartbeat into them; the vibrations cause havoc inside the plugged objects. She can use her earphone jacks to catch sounds, giving the her the ability to hear across even extremely thick walls. She can use them like whips in combat; they can stretch up to 6 meters and the sound radius is approximately 12 meters. They are strong enough to shatter rocks. She can also plug the jacks into the boots of her costume which have speakers that allow her to shoot sound in a specific direction.
 * Cancelling (相殺): This move allows Kyoka to block out other sounds.
 * Heartbeat Fuzz: Kyoka plugs her jacks into the amplifiers on her forearms. She then slams the amplifiers onto the floor and channels a powerful heartbeat through them that shatters the ground.

Musical Talent: Kyoka is able to play the bass. It is also implied that she can play other instruments as well.

Equipment
Amplifier Jack: Devices that Kyoka can plug her jacks on, amplifying even further the sound and vibration of her heartbeats. They are worn on both her forearms.

Battles
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Unforeseen Simulation Joint Arc

 * Momo Yaoyorozu, Kyoka Jiro & Denki Kaminari vs. Villains: Win

Final Exams Arc
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 * Kyoka Jiro & Koji Koda vs. Hizashi Yamada: Win

Denki Kaminari
They are paired together during the Battle Trial and the Unforeseen Simulation Joint. They can hold casual conversations, but most of the time, they will argue or even more likely, Kyoka will tell him rude things that will put his mood down. Kyoka also happens to find Denki's brainless state uncontrollably funny.

Momo Yaoyorozu
During the Unforeseen Simulation Joint Arc, they fight villains together with Denki. Momo helps her study for the class midterms. When the class splits up to go shopping for the training camp, they pair up and go off shopping together. Kyoka is also somewhat defensive of her, as she hits Hanta for upsetting Momo with his comment about her Quirk.

Trivia

 * In the preliminary stages of the manga, Kyoka was virtually unchanged from her original design, albeit her hair lacked its signature streaks.
 * Kyoka's known U.A. data is as follows:
 * Student No. 12 in Class 1-A
 * Ranked 17th in the Quirk Apprehension Test
 * Ranked 7th in Class 1-A's grades.
 * Ranked in the Top 42 of the U.A. Sports Festival First-Year Stage.
 * Kyoka's rankings in the Popularity Polls are as follows:
 * Kyoka ranked 16th in the First Popularity Poll.
 * Kyoka ranked 7th in the Second Popularity Poll.
 * Kyoka's name contains the kanji for "ear" (耳), "sound/reverberation" (響), and "incense" (香).
 * Kyoka likes rock and can play the bass.
 * Kyoka's hair streaks are drawn similarly to the waves of an EKG, a possible reference to how she uses her earphone jacks to amplify her heartbeat.
 * Her Hero name is the same as her Quirk's name. So far, she is the only known person to do this.

Quotes

 * (To Koji Koda about using his Quirk to combat Present Mic) "If you do this, we just might win. But there's no time to hesitate, so do it now! You wanna be a hero, don't you?! Then let's pass this test."

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