Eijiro is a muscular young man of average height and a rather impressive physique for his young age. He has red eyes pointed slightly inwards, and a small scar just above his right eye. He also has small eyebrows and pointed teeth. His hair is somewhat long, dyed a bright red, and spiked away from his head at all angles with gel, with two more pronounced tufts spiked on either side of his forehead like little horns. This lofty style takes a full three minutes to set.

Lupin’s physique varies across adaptations. In some portrayals he appears lean and wiry, while in others he is drawn more muscular. He typically carries himself with a slight slouch, his neck extended forward. His walk is distinctive, with his hands in his pockets, jacket draped loosely, and knees angled outward.

At U.A., he wears the standard U.A. uniform, but with dark red trainers instead of the usual brown dress shoes.

In his hero costume, Eijiro wears two dark red gear-shaped shoulder pads. A similar colored jagged sash joins the one on his left to the right side of his belt, which has a red “R” set into its center, standing for his hero name: Red Riot. Below this, he wears baggy black pants and a red half cape with a ripped hem. He also sports dark red boots and thick rings around his calves. He leaves his chest bare and wears a wired guard around his face, reaching from just above his hairline to below his jaw, an extra piece going over the bridge of his nose, and some spiked pieces around his mouth that resemble little fangs. Overall, the look slightly resembles that of an Oni.

During the Provisional Hero License Exam Arc, Eijiro’s costume later gained black sleeves, which he wears to prevent civilians from being hurt by his Quirk, Hardening, during rescues

Eight years later after the end of the Final War, Eijiro has grown taller and bulkier. His hair has gotten spikier and a bit longer, extending to his shoulders. He also has two spiky strands sticking up like a horn. His hero costume also remains identical aside from a longer half cape.

Eijiro is a boisterous and outgoing guy with a fondness for manliness, often using the terms “manly” and “unmanly” to describe things and people he does or doesn’t like, respectively. Those who showcase a noble, brave, or determined attitude tend to emotionally move him to tears, quickly earning his complete admiration, respect, and friendship. Similarly, he will call out traits that are the opposite of that, such as cowardice and dirty play. Eijiro is determined and selfless, bravely putting the safety of others before himself. He is also a big fan of Crimson Riot, a retro hero from whom he takes inspiration, including personal values and his hero name.

Eijiro is very honest and kind-hearted, having a straightforward way of thinking and following a specific code of chivalry that motivates him to live without regret. Thanks to his respectful and encouraging attitude, he’s easily capable of making friends with most people he encounters, particularly those that show as much passion and resolve as he does. Loyal and dedicated to his friends, Eijiro is willing to break laws and rules to help or save them, becoming regretful if he cannot come to their aid. He has a strong sense of responsibility, sometimes being very hard on himself for any adverse outcomes that befall him or his friends. As such, he’s always thinking about further improving his abilities and strengths to not feel weak or burdensome to others, which is how Eijiro overcame his earlier impulsiveness in battle and weak academic performance; as a result of his hard work, he’s become smarter and wiser over time.

Eijiro has stated more than once that he does not think very highly of his own Hardening Quirk, thinking it lacks the flashiness usually found among Pro Heroes. He will get downright offended if he sees someone with a similar Quirk

Eijiro is worried about not having a good enough Quirk for hero work and that his skills could not compare to other hero prospects. A lot of this self-doubt seems to have come from an incident in Junior High when he saw Mina Ashido stop an underclassman from being bullied and save some students from a threatening figure.

Overall Abilities:Eijiro has proven to be a formidable combatant. His abilities earned him second place in the U.A. Entrance Exam, having a fair balance of both villain and rescue points, and 8th place in the Quirk Apprehension Test.Thanks to his Quirk, Red Riot’s straightforward and reckless fighting style lets his hardened body take opposing hits while delivering counterattacks. Even bullets cannot pierce his skin when his Quirk is active,meaning that Eijiro can turn himself into a shield for allies or defenseless civilians.

During the U.S.J. Incident, he and Katsuki attempted to take on Kurogiri before being warped away,[15] leaving the pair to battle and soon defeat, low-tier members of the League of Villains.[16] Eijiro has shown to be as formidable as Tetsutetsu Tetsutetsu, and due to their similar Quirks and fighting styles, the two were evenly matched during their battle at the U.A. Sports Festival, which resulted in a draw.[17] The two hard-headed students were still on par with each other during their arm wrestling tie-breaker until Tetsutetsu’s Steel Quirk began to weaken due to insufficient iron intake.[18] Later, Eijiro impressively forced Katsuki, one of Class 1-A’s strongest students, on the defensive for some time during their match before Eijiro’s Quirk began to weaken, causing him to lose the battle

When he first underwent Hero Work-Studies, under the tutelage of Fat Gum, Red Riot confronted a villain who could protrude metal blades from his body. He was initially taken by surprise when the blade villain used the Trigger drug to enhance his Quirk, but after bringing his Hardening to its maximum durability, the red-haired hero was able to overcome the villain’s increased power and defeat him.[

Amid the Shie Hassaikai Raid, Red Riot and Fat Gum faced off against Kendo Rappa and Hekiji Tengai of the Eight Bullets, but he was heavily struck by a powerful punch from Kendo, leaving him out of commission for the majority of the duel. Eventually, Red Riot regained his resolve, stepped in to endure Kendo’s volley of punches efficaciously, and had the mettle to directly engage the former cage fighter with a blow that could have negated that of the latter, but Hekiji intervened with a barrier

During the first round of the Joint Training Battle, Eijiro and Koji Koda launched a collaboration attack on Jurota Shishida of Class 1-B that forced the latter into evading the said assault, implying their combined onslaught would’ve been effective against someone of his caliber. Jurota himself admitted that Eijiro was the only person in their battle that could pose a threat to his abilities, so he swiped the sturdy student aside to be captured by Ibara Shiozaki

Enhanced DurabilityEijiro has above-average durability even without his Quirk. According to Katsuki, although Eijiro took a barrage of point-blank explosions during their fight at the U.A. Sports Festival, this was not due to his armored skin alone. This proves that Eijiro’s natural durability is relatively strong, but can be amplified by his Hardening Quirk

Indomitable WillA prominent aspect of Eijiro is his die-hard chivalry. During his middle school days, he lacked the courage to stand up for others, despite desperately wanting to, but was too afraid to do so. However, after watching a video containing Crimson Riot’s speech on chivalry and heroic ideals, Eijiro re-evaluated himself and became a virile person who desires to help others no matter how scared he may be, even if it means recklessly rushing into situations. Eijiro changed his original black hair to the spiked, red appearance he now possesses to symbolize his admiration for Crimson Riot and his reformation into a more courageous person.[10][5] Red Riot’s heroic spirit remained steadfast when he voiced his intent to help save Katsuki, who had been abducted by the League of Villains, and proclaimed that he wouldn’t stand by and do nothing

At the beginning of his and Fat Gum’s battle against Kendo and Hekiji, Red Riot was incapacitated by Kendo’s punch and despaired over being unable to help Fat Gum, who was being repeatedly pulverized.[21] But after recalling his past hopelessness and the inspirations that pushed him to grow, he regained his resolve, refortified his hardened body, and withstood Kendo’s bullet punches far better than before, nearly taking the brawler head-on. Hekiji was ultimately forced to defend his partner with a barrier. Because of Red Riot’s determination, Fat Gum gathered the accumulated kinetic energy from Kendo’s punches and defeated the yakuza duo. In the aftermath, both Fat Gum and Kendo acknowledged Red Riot’s fighting spirit, with the latter even wanting a rematch in the future