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Metal Bat (金属バット, Kinzoku Batto) is a S-Class, rank 16, superhero for the Hero Association.

Appearance
Metal Bat is a young man with black hair styled in a pompadour and dark eyes that emphasize his hot temper. He wears black hakama pants and black gakuran, which he drapes over his red long-sleeved turtleneck.

Personality
He appears to have a great deal of confidence in himself stating that he did not care whether a threat is a Demon or Dragon level, he would take care of it himself. He also seems to be brash and reckless, as shown when he immediately smashed one of Melzalgald's marbles instead of trying to analyze what purpose it serves for the enemy. Furthermore, he was willing to challenge Handsomely Masked Sweet Mask for his mockery attitude before it was interrupted by a call from his sister and Sweet Mask's client. He speaks in a very rough dialect, pronouncing 'yer' instead of 'your' for example.

Through flowers and storms, he only carries one weakness… his younger sister! For her sake, he is willing to throw away his life! Despite his brash attitude, he still has a soft side in him when it comes to his sister, who he treats very well and spoils to an extent. He has also shown similar love towards his pet cat, Tama. Like Saitama, he doesn't care about his rank and sometimes accidentally kills his enemies faster than he intended, such as when he killed Rafflesidon and Senior Centipede before he could get any answers for their motivations. This is different from Sweet Mask's merciless nature.

Alien Conquerors Arc
Metal Bat is first seen during the S-Class heroes meeting. From there, he proceeded to fight alongside the other S-Class Heroes against some of the alien invaders. With the aid of Bang and others, they are able to destroy a good portion of the Mothership and kill Melzalgald. Metal Bat is later seen arguing with Sweet Mask and threatens to start a fight with him. But before he has the chance his sister calls him and Metal Bat suddenly changes his attitude and tries to get an autograph from Sweet Mask.

Hero Hunt Arc
Metal Bat reappears briefly in the Hero Hunt arc. He is shown protecting sponsors of the Hero Association. He watches over the sponsor and sponsor's child eat. He tells the child to not put the dishes that the child has finished back in the counter, but the child doesn't listen, much to Metal Bat's displeasure. Metal Bat soon receives a call from his sister; she asks if he can help her with her shopping bags, but he replies, no, because he is on a mission. His sister starts crying and hangs up the call. After the call, Metal Bat feels a sudden shaking. Metal Bat rushes back to the sponsors and finds that Junior Centipede has emerged from the ground with Human Bird Grass. Furthermore, Junior Centipede has grabbed the sponsor's child. Before the monsters could grab the sponsor, Metal Bat grabs a coat and engages in a fight with the mysterious beings.

Centipede Arc
Metal Bat has just finished his fight with Junior Centipede and Human Bird Grass. The Hero Association's sponsor and his child are delighted and wish to celebrate. However, Junior Centipede was still alive, he praises Metal Bat for his strength, but still questions Metal Bat about how high Metal Bat is in the food chain. Before Metal Bat could finish Junior Centipede off, Senior Centipede erupted from the ground. Senior Centipede forced Metal Bat, the sponsor, and the sponsor's child out of the restaurant. Outside, Rafflesidon emerged from the ground and started releasing sleeping gas. The sponsor and the sponsor's child immediately fall unconscious. Metal Bat is left to fight two Demon level monsters, three if Garou were to join the fight as well.

During the battle with Senior Centipede and Rafflesidon, Metal Bat temporarily came under the control of Rafflesidon's gas. When under the influence of the gas, Senior Centipede gave Metal Bat a beating. However, Metal Bat was eventually able to resist the influences of the gases and then completely escaped its influences after injuring his own head. After regaining control, Metal Bat proceeded to defeat Senior Centipede and Rafflesidon with one strike each. However, only after the monsters were defeated did Metal Bat remember that he had not asked for their motivations yet.

After the demon level monsters were defeated, B-Class and C-Class heroes, Pineapple and Mohican, arrive to the scene. Metal Bat asks them to bring the Hero Association's sponsor and the sponsor's son to hospital so that he could finally help his sister with her shopping bags. However, Elder Centipede emerges from the ground. The lower class heroes inform Metal Bat about the monster, stating that is previously wiped out a town and it is marked as a dragon level monster. Metal Bat tells the two other heroes to grab the sponsor and the sponsor's child and run, while he prepares to go all out.

Metal Bat intercepts Elder Centipede when the monster is charging at Pineapple and Mohican, but his attack did not manage to even leave a scratch. Metal Bat is then launched to building by Elder Centipede. Metal Bat jumps onto Elder Centipede while Elder Centipede is chasing after two heroes. Before Elder Centipede is able to reach the two heroes, Metal Bat unleashes an attack on Elder Centipede's head. Elder Centipede then tries to shake Metal Bat off by with maneuvering around the city. Metal Bat is then launched hundreds of meters across the city and encounters Garou. The Hero Organization later tries to contact him but is unable to do so due to the fact that Garou is attacking him. He's able to hold back against Garou, who is now much stronger than before due to his extensive training and is already able to see Metal Bat attack patterns and comments he's disappointed on being unable to witness Metal Bat at his best.

Metal Bat retaliates with an attack, but Garou manages to dodge it. Garou is surprised by Metal Bat's persistence despite Metal Bat's numerous injuries, but insists that Metal Bat is at his limit. Suddenly, Metal Bat rushes to Garou with incredible speed. Garou still manages to avoid Metal Bat's attacks and attempts to counterattack, but Garou's attack are no longer able to faze Metal Bat either. Garou asks Metal Bat for the reason for this sudden increase in physical strength and Metal Bat simply explains that "It's Fightin' Spirit!". Metal Bat tells Garou to hurry up with the fight because he still needs to take care of a monster. Garou throws a manhole cover at Metal Bat, but Metal Bat hits it back with his bat. However, Garou already managed to reach Metal Bat by the time Metal Bat followed through. To counter Garou's swift attack, Metal Bat tackled him and launched him toward the ricocheted flying manhole cover. Garou's manages to catch the cover however. Metal Bat tells Garou to not be full of himself. Garou suddenly launches a barrage of attacks at Metal Bat. Metal Bat tries the take the offensive, but none of his attacks connect. Garou continues to mock Metal Bat, asking him if he's going to persist until he dies. Metal Bat retorts by saying he'll fight until he wins and proceeds to initiate a killing move. Unfortunately, Garou manages to repel the attack and launch a blow to Metal Bat's chest, leaving Metal Bat laying on the ground. Abruptly, someone shouts, "Big Brother!".

Metal Bat is about to land a powerful blow on Garou but Metal Bat stops because his sister is there. Garou then punches Metal Bat, but before they could clash again, his sister jumps right in front of Metal Bat, saying that Metal Bat made a promise not to fight while she's around. Garou gets angry, but respects their promise and leaves the fight to pursue for Watchdog-man.

After Zenko explains why she's there and remembers about the Monsters kidnap, Metal Bat tries to meet Elder Centipede again, but Zenko hits him in the back of the head and Metal Bat falls on the floor unconscious due to his exhaustion.

Abilities & Powers
As a S-Class hero, Metal Bat is very powerful. Despite his low rank, he is believed to be one of the strongest S-Class heroes as he was able to threaten Sweet Mask, one of the strongest characters in the series with little to no fear.

He is capable of taking on multiple demon level monsters, such as Senior Centipede and Rafflesidon, and even hold his own against a dragon class opponent.

Physical Abilities
Fighting Spirit (気合い, Kiai): During battles, Metal Bat is capable of getting stronger with the more damage he takes. This is because of his will to continue to fight no matter what happens. Instead of succumbing to damage he receives, Metal Bat gets stronger and more powerful, gaining an increase in strength and speed. In addition, Metal Bat becomes more durable as he was later unfazed by the attacks of Garou even when he used Water Stream Rock Smashing Fist. However, his Fighting Spirit lowers extremely fast when he is out of battle as his sister was able to knock him out with one hit after his fight with Garou, which would otherwise not be the case if his fighting spirit was still high.
 * Mental Resistance: Metal Bat cannot be completely controlled by mind control abilities. He was able to somewhat resist Rafflesidon's gases and by hitting himself with his bat, Metal Bat was able to entirely escape the influences of Rafflesidon's gases.

Increasing Strength: "When the intensity of Metal Bat's anger reaches its maximum, his power approaches infinity." Metal Bat possesses immense physical strength and has taken out many powerful monsters and villains with a single swing, including two demon-class level monsters simultaneously. While being unable to kill the Elder Centipede with one hit, he did push it down and completely stop it in its tracks. Alongside his Fighting Spirit, Metal Bat is able to vastly increase his strength, granting him power to easily destroy buildings and tear the ground causing powerful shockwaves. Even Garou complimented him, stating that if he was hit by the bat, even once, he would have lost the fight.

Immense Durability: Metal Bat also possesses immense durability. He was able to take many hits from Senior Centipede, a demon class level monster, and from Garou, an extremely powerful fighter capable of easily defeating super-human foes. In addition, he received a direct hit from Elder Centipede, but did not seem to be fazed by the attack afterwards. His durability also becomes more powerful with more Fighting Spirit as the fight between him and Garou progressed, he became almost immune to some of Garou's attacks.

Immense Speed & Reflexes: Metal Bat was able to escape a falling spaceship and he even considered Puri-Puri-Prisoner slow. Metal Bat also possesses superhuman reflexes as seen in his fight against Garou, where he's able to deflect and block Garou multiple punches despite being injured in his battle against Elder Centipede. Metal Bat's speed, with Fighting Spirit, can even grow to be too fast for Garou's martial arts to compensate.

Fighting Style
Highly Perceptive Combatant: Despite his brash nature, Metal Bat seems to be very perceptive, as he was the first one to discover Melzalgald's weakness. In addition, he was able to notice that Elder Centipede avoided getting his head in contact with Metal Bat's attack.

Killin' Moves: Metal Bat's deadly techniques which are used to finish off his opponents. He always utilizes his signature bat when performing those attacks.
 * Dragon Thrashing (怒羅厳シバき, Ika Ra Gen Shibaki): Metal Bat unleashes an barrage of smacks with his metal bat against a target. This attack was first seen used against Elder Centipede.
 * Savage Tornado (野蛮トルネード, Yaban Torunēdo): Metal Bat wildly spins in circles with his trademark weapon. The attack is powerful enough to cause slight damage, even if the opponent were able to repel all hits.

Equipment
Metal Bat: Living up to his name, Metal Bat carries a gray metal bat, which has a black handle. Metal Bat uses his metal bat to take care of monsters. It is, with Metal Bat's strength, strong enough to kill demon class monsters with one hit.

Hero Rating
Metal Bat's rating determined by the Hero Association.

Anime and Manga difference
Episode 2
 * Metal Bat's photo appears on Dr. Genus computer screen in the House of Evolution.

Quotes

 * "Demon, Dragon, Whatever, just lemme take care of it!"


 * "All I need is some fighting' spirit and it'll all work out."


 * "Don't worry, I'll be gentle."


 * "Ah! I completely forgot to ask about the monsters' motivation!"'

Trivia

 * ONE has said that Metal Bat wasn't joking when he said, "He could take care of a dragon level threat".


 * The situation against the Monster Association would have changed, if Metal Bat was around.


 * His voice actor, Wataru Hatano, is also known for voicing the pompadoured Josuke Higashikata in Jojo's Bizarre Adventure: All Star Battle and Eyes of Heaven.


 * He shares the similar character design style to his sister, specially the hair and eyes.


 * There is a possible reference when Metal Bat extends an arm holding his bat and fixing his sleeve. A professional baseball player, Ichiro Suzuki does a near identical pose. Ichiro's pose, Metal Bat's pose