Mezo Shoji/Synopsis

History
At some point, something happened to Mezo that caused him to start wearing a mask across his face. What this event was has not been stated.

Entrance Exam Arc
Mezo makes a brief appearance during the Entrance Exam, using his Quirk from the top of a building and monitoring his surroundings.

Quirk Apprehension Test Arc
Mezo is seen participating in the Grip Strength Trial, where he excels with a grip of 540 kilograms. Hanta Sero comments that Mezo brings to mind an octopus.

Battle Trial Arc
Mezo is paired off with Shoto Todoroki for the Battle Trial, where they get to face Mashirao Ojiro and Toru Hagakure. Due to Shoto's power, Mezo's role in the trial ends up being rather minor, using his Quirk to locate their opponents and then leaving the building under Shoto's request, who proceeds to freeze the entire building and recover the warhead by himself, giving them the win.

U.S.J. Arc
During the League of Villains' invasion at the Unforeseen Simulation Joint, Mezo and his classmates are faced with Kurogiri, who warps most of the class to different points of the building. Mezo is able to avoid this though, managing to protect Hanta Sero and Mina Ashido from being warped as well. After Kurogiri's attack, Mezo is able to confirm to Thirteen and Tenya Iida that all warped students are still in the simulation joint before they start confronting the warping villain himself.

As Tenya attempts to escape the building in order to call for reinforcements, Kurogiri tries to prevent him from leaving. Mezo manages to protect Tenya from one of Kurogiri's attacks, and thanks to the combined efforts of Ochaco Uraraka, Hanta, and Rikido Sato, Kurogiri is successfully warded off as Tenya manages to run away unscathed.

U.A. Sports Festival Arc
Mezo places 14th in the Obstacle Race, allowing him to participate in the next event, the Human Cavalry Battle. Minoru asks him if he could team up with him, which he allows after hearing his plan.

After the Human Cavalry Battle starts, Mezo and his team attack Izuku's team, carrying Minoru Mineta and Tsuyu Asui on his back while hiding them with his tentacles. After Minoru orders Mezo to attack, Mezo begins charging at Izuku and Shoto's teams, but Denki releases a huge amount of electricity, electrocuting Mezo and his teammates and become stunned as a result, unable to move. Shoto then freezes Mezo's legs, stopping him in his tracks. After the Human Cavalry Battle ends, Mezo and his team fail to qualify for the final event.

Mezo along with his class watches the closing ceremony of U.A.'s Sports Festival.

Vs. Hero Killer Arc
Two days after the Sports Festival, Mezo is in class. During the Hero Informatics period, Class 1-A has to decide on Hero names. Mezo writes down and reveals his Hero name: Tentacle Hero "Tentacole".

After Class 1-A is finished formulating their Hero names, Mezo is given a list of 40 workplaces in order to choose a workplace that he wants to train at. On the day of the workplace training, Mezo is at the train station with his class so that he can travel to the workplace of his choice by train.

Final Exams Arc
Back in class, Izuku reveals the content of the exercise test to the class, much to Denki and Mina's happiness; Mezo notes that they are happy because they do not have to adjust their Quirks for real-life opponents. 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. Mezo is paired with Toru and they must face Snipe in their test exam.

Mezo, Toru, and Snipe arrive in an uninhabited city where their test exercise will take place. Snipe explains the 30-minute test; Mezo and Toru must either handcuff him or one of them must escape the battlefield within 30 minutes in order to win and pass the test.

During their battle, Snipe corners Toru and Mezo behind stone pillars. Mezo admits escaping will be difficult because their only advantage is the weights Snipe is wearing. Snipe throws a smoke bomb and fills the area with smoke. Then, he moves towards them and shoots down the pillar they're hiding behind. Mezo moves to another pillar and asks Toru if she's okay, but realizes that she has disappeared. Mezo realize she's taken off her clothes and gone into full stealth mode. Understanding her intentions, Mezo decides to runs out to distract Snipe, and the teacher shoots at his feet before warning him not to be hasty. Mezo raises his hands and Snipe questions if he's giving up. Suddenly Toru handcuffs Snipe, taking him by surprise. After this difficult battle against Snipe, Mezo along with Toru pass the practical test.

Back in class at U.A., Mezo learns that he passed the written test and will go with his classmates to the forest lodge which is a boot camp. Mezo along with his class go to Kiyashi Ward Shopping Mall to buy necessities for the forest lodge.

My Hero Academia: Two Heroes
At some point Mezo arrives to I-Island along with Fumikage.

On the night of the I-Island preview, Fumikage and Mezo our hanging out in the streets in the Business Area. A curfew announcement is made, so they rush back to their hotel room.

Mezo hangs out with the rest of his class after the I-Island Expo opens up.

Forest Training Camp Arc
Due to a shopping center incident, where Izuku had an encounter with Shigaraki, 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.

Following the end of the semester, Mezo, along the rest of Class 1-A boys, is invited by Deku to participate in an endurance training session, an idea of Mineta and Denki (an excuse to be able to see the girls in bikini). When Katsuki arrives and challenges Izuku, the boys opt to compete against each other by sprinting down the pool. Aizawa arrives to kicking all the students out of the pool area due to the expiration of their time limit.

On the day of the summer camp, they are informed that the new destination will be a mountainous region, owned by the professional Hero Team, the Wild, Wild Pussycats, where they will undergo reinforcement training to strengthen and upgrade their Quirks which will also allow Class 1-A to obtain their temporary licenses. Class 1-A’s bus stops for a restroom break, where they meet Pixie-Bob and Mandalay, who challenge the students to reach base camp past the forest in three hours. Then, all Class 1-A is forcibly thrown into Beast's Forest by Pixie-Bob's Quirk

To reach their destination, they must traverse the forest, which is inhabited by dozens of hostile earth monsters created by Pixie-Bob. The Students work together to fight their way through the forest. To help his classmates, Mezo, along with Kyoka, use his Quirks to detect the location of the approaching beasts. The journey through the forest to the Cabin takes them around eight hours before finally arrive at the facility, battered and tired. Class 1-A fetch their luggage from the bus and put it in their rooms, and later go to the dining hall and the Pussycats serve dinner.

The next morning, 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. Mezo trains together with Toru to increaseg the strength of both their Quirk by having Mezo quickly create multiple dupli-arms to look for Toru while she uses her invisibility to further hide her presence.

On the night of the third day of training, Mezo is paired with Fumikage for the test of courage. During the test of courage, the League of Villains Vanguard Action Squad begin their attack by filling the forest with poisonous gas. One of the villain's squad members called Moonfish ambushes Fumikage and Mezo. Mezo covers for Fumikage but loses one of his tentacles in the process. They manage to retreat from Moonfish. However, the ambush causes Fumikage to lose control of his Quirk. Mezo saves Izuku from Dark Shadow's claw and explains the situation to him. They turn their attention to Fumikage; Fumikage has been restrained by Dark Shadow, who is now larger and more ferocious due to the power of darkness. The empowered and berserk Dark Shadow begins taking control of Fumikage's body. Struggling, Fumikage pleads Izuku and Mezo to run away from him otherwise they will die. Izuku watches in shock.

The rampaging Dark Shadow attacks and destroys several trees around it. Dark Shadow attacks Mezo and Izuku, but Mezo is able to dodge in the nick of time. After maneuvering behind a tree, Mezo sees that Dark Shadow attacks anything that moves or makes, while also noting that Fumikage's regret and indignation is intensifying Dark Shadow's control over Fumikage as well as its own power. Fumikage pleads Mezo and Izuku to save the others and forget about him. Mezo informs Izuku that they need light to calm Dark Shadow down so that Fumikage can regain control; he tells Izuku that he can distract Dark Shadow while he runs back to the facility for help; Izuku is indecisive due to wanting to save Katsuki as well. Before Izuku can reply, Dark Shadow strikes at them, but Mezo is able to evade. Seeing that their situation is desperate, Mezo tells Izuku that he can either save Fumikage with him or save Katsuki by himself. Izuku apologizes to Mezo because he cannot make that decision and says that he has a plan.

Mezo and Izuku arrive to where Katsuki and Shoto are along with Dark Shadow in pursuit, with Mezo asking one of them to make light. Before he can explain further, Moonfish senses Mezo and Izuku's presence and sends one of his teeth to attack them. The rampaging Dark Shadow uses its enormous claw to crush Moonfish, destroying Moonfish's teeth and knocking him out. Shoto and Katsuki are surprised at what happened. Izuku's plan was to lure the rampaging Dark Shadow to their location by creating decoys from Mezo's Dupli-Arms which worked. Izuku is happy to see Katsuki, glad that he does not have to save only one of his classmates and sacrifice the other.

After the rampaging Dark Shadow effortlessly defeats Moonfish, Shoto and Katsuki use their Quirks to calm down Dark Shadow, returning Fumikage to normal. Now back in control, Fumikage thanks Katsuki and Shoto for saving him. Mezo is glad that Fumikage is fine. However, Fumikage is regretful that he could not conceal his anger when Mezo lost one of his arms, which caused him to release Dark Shadow out of anger and lose control due to being enraged and spurred on by Dark Shadow's own rage. Fumikage is guilty for harming Mezo; Mezo tells Fumikage that he does not need to feel guilty and shows no ill will towards Fumikage.

Izuku tells Fumikage that their top priority is to protect Katsuki, who is the target of the villains. Izuku decides that they should escort Katsuki back to the facility and take a shortcut through the forest; Izuku thinks that with the power of Mezo's scouting capabilities, Shoto's powerful Quirk and the unrivaled power of Fumikage's Dark Shadow, escorting Katsuki will be a cinch. However, Katsuki is angry that he needs protecting and refuses their help. The Bakugo Escort Squad (consisting of Mezo, Shoto, Izuku, and Fumikage) begin escorting a begrudging Katsuki back to the facility. The Bakugo Escort Team travels to the facility and comes across Ochaco and Tsuyu. When Ochaco and Tsuyu notice that Katsuki is not with them, Izuku, Mezo, and Shoto turn around and see that not only Katsuki has disappeared but Fumikage as well. After the masked magician-like villain reveals to be the one who took Katsuki, Izuku demands that he give Katsuki back.

After handing Kosei to Ochaco, Shoto attempts to stop Mr. Compress by trying to freeze him with his ice attacks, but Compress's speed allows him to avoid Shoto's attacks. Mr. Compress also reveals that he captured Fumikage as well due to being impressed with his victory against the powerful Moonfish and states that he will be very useful, much to Izuku's anger. Compress begins escaping. Izuku hatches a plan to save Fumikage and Katsuki; Izuku asks Ochaco to make him, Shoto and Mezo float, then tells Tsuyu to use her tongue to throw their weightless bodies as hard as she can towards the magician, which will allow the three of them to fly towards the villain with Mezo using his arms to guide their trajectory; once they are in reach of the villain Ochaco will deactivate her Quirk. However, Ochaco and Shoto see that Izuku's injuries are severe and think he should stay put. Izuku insists that he goes along which convinces Ochaco and Shoto.

They execute the plan; Tsuyu wraps her tongue around Izuku, Mezo and Shoto while Ochaco uses her Quirk to make them weightless. Tsuyu throws the weightless Izuku, Mezo and Shoto towards Mr. Compress. The three fly at Compress at high speed and reach him. Ochaco deactivates her Quirk, causing them to land on Compress and smash him onto the ground. Izuku, Mezo, Shoto and Compress landed right at the Vanguard Action Squad's rendezvous point. After apprehending Mr. Compress, Izuku, Shoto and Mezo see that they are right in front of Dabi, Himiko and Twice.

Dabi launches his flames which hits Mezo's arm and injures it. After Himiko attacks Izuku, Mezo smacks her away from Izuku. Mr. Compress prepares to give Dabi the captured Fumikage and Katsuki, only to find that the marbles are not in his pocket. Mezo reveals that he took the marbles from Mr. Compress. As Izuku and Shoto prepare to backup Mezo, Kurogiri arrives and blocks their path. After Himiko, Twice and the Nomu escape, Mr Compress reveals that the marbles Mezo took are not the captured targets and are decoys instead; the marbles Mezo took transform into ice, which shocks Mezo. Mr. Compress removes his mask and sticks out his tongue which has the actual marbles. Having overheard what is happening; Yuga takes action and fires his Navel Laser at Mr. Compress's face, which breaks Compress's mask and causing Mr. Compress to spit out the marbles containing Fumikage and Katsuki.

Izuku, Mezo and Shoto rush to grab the marbles, although Izuku starts succumbing to his injuries which causes him to fall to the ground. Mezo and Shoto continue rushing towards the marbles; Mezo grabs the marble containing Fumikage, thus saving him. Shoto is almost in reach of the marble containing Katsuki and nearly grabs it, but Dabi snatches it away before Shoto can grab it.

Mr. Compress deactivates his Quirk, freeing Fumikage and Katsuki. Mezo, Shoto, Izuku and the freed Fumikage see that Katsuki has teleported away with the Vanguard Action Squad.

Hideout Raid Arc
After the Vanguard Action Squad leave, the training camp ends and Mezo returns home. Two days later, Mezo visits Izuku in the hospital and hears about Eijiro and Shoto's plan to rescue Katsuki. As Tenya orders them to stop thinking about such an attempt, Mezo stops Tenya. Mezo understands Eijiro and Shoto's frustration in not being able to save Katsuki and advises that they should not make the decision based on their feelings. Mezo leaves Izuku's room after the doctor requests them to.

Provisional Hero License Exam Arc
Due to the kidnapping of Katsuki, the students had to be transferred to Heights Alliance, a series of doors built by Nezu in order to protect the students. Shota meets with his students outside of the building. He states they must start preparing to get provisional hero licenses like they had planned to during the training camp. Before allowing Class 1-A students to enter in their new residence, Shota scold the entire class for having allowed five of them to rescue Katsuki without a license and did nothing to stop them. He further more says he would have expelled everyone but Katsuki, Toru and Kyoka, if it weren't for All Might's sudden retirement and asked them to stick to the rules from now on.

U.A. School Festival Arc
At U.A. High School, Class 1-A along with Shoji choose to make a band and dance performance for the U.A School Festival.

Joint Training Arc
Mezo, along with the rest of Class 1-A are pitted against Class 1-B as part of the Joint Training Battle. He is placed in the third round of match-ups.