The Tank Topper Army (タンクトッパー軍団, Tankutoppā-gundan) is a group comprised of the Tank Toppers, under the leadership of Tanktop Master.
Every member of the Tank Topper Army wears a tank top. The designs of each member's tank top vary.
Every member of the Tank Topper Army takes great pride in their tank tops and associates them with a symbol of strength and pride. Many of the members are shown to be extremely rude and arrogant towards everyone but their leader, although Tanktop Master does not approve of this behavior. All of the members of this army worship the words of Tanktop Master, and believe that the path to true strength is through tanktops: ironically, Tanktop Master believes this more than anyone, as seen when he observes Bang dominating Metal Bat in their sparring match, he concludes that the secret to Bang's power is that he has a tank top hidden underneath.
Tanktop Tiger was asked by a civilian about a suspicious person, the person being Saitama. Tanktop Tiger immediately yells out his names introducing himself to Saitama and disregard him of being a new hero. Tanktop Tiger taunts Saitama to look better, but was cut off by Speed-o'-Sound Sonic, who threw exploding shurikens at him, leaving him unconscious.
After the meteor was destroyed by Saitama and heavily damaging Z-City in the process, Tanktop Tiger confronts Saitama with his older brother Tanktop Black Hole. The pair accuse Saitama for taking credit of S-Class heroes to jump ranks. Tanktop Black Hole uses his loud voice to gather a mob around them, chanting for Saitama to quit being a hero. As the mob is chanting against Saitama, Tanktop Black Hole deceives the civilians into thinking Saitama tries to attack them. The brothers challenge Saitama to "protect" the civilians as part of a publicity stunt, but were easily defeated with Tanktop Black Hole apologizing profusely. 
Tanktop Master attends the S-Class hero meeting, there he recognizes Saitama's name, but is unable to recall where he had heard it. During Dark Matter Thieves invasion on A-City, Tanktop Master attempted to assist Tatsumaki, but failed after realizing he was no match for her psychic powers.
Tank-top Vegetarian happened to encounter Garou, who began his hero hunt and was easily defeated by him. After being released from the hospital, Tanktop Vegetarian, alongside the entire Tank Topper Army, track down Garou who was about to fight Mumen Rider, but was struck immediately. As Garou declared to kill every member, Tanktop Master punched him and used Tanktop Tackle, but to his surprise Garou was able to stand. Tanktop Master and Garou fight briefly, with Tanktop Master having the upper hand. As he was about to finish the fight, Mumen Rider steps in, stopping the fight, believing Garou had already taken enough beating, to which he agrees. However Garou chose not to stop and used Water Stream Rock Smashing Fist and easily defeated all the members, Mumen Rider and Charanko.
Monsters attack the hospital Tanktop Master and Mumen Rider are staying at. Tanktop Master uses Tanktop Tackle against the monster, causing it to fly through the hospital wall and down onto the pavement below.
Tanktop Master leaves the hospital with Mumen Rider in order to assist the civilians that are waiting for aid in the Z-City area. The rest of the Tanktop Army are inspired by their leaders' actions and follow in his steps by going towards Z-City to further help with the situation.
Powers and AbilitiesEdit
While the depths of most of their power hasn't been seen, many of the members of the Tank Topper Army are in the Hero Association, with some of them holding decent spots in the rankings. When working together, the Tank Topper Army can defeat a demon-level monster, although it's unclear as to how much Tanktop Master assisted the others in the battle. Unfortunately, they were all utterly decimated by Garou, including Tanktop Master.
Appearances in Other MediaEdit
The tank toppers are seen training after the battle with the Dark Matter Thieves when a mysterious robot appears outside the Hero Association headquarters and the tank toppers are asked to defeat it. The giant vehicle launches several drones and only Tanktop Master is able to defeat one. It is soon revealed that the vehicle and drones belong to Metal Knight who later cleans up the city and builds a new Hero Association headquarters in just a week.
- A running gag for the Tank Top Army is that they are always beaten or humiliated.
- Tank Top Tiger gets hit by Sonic's Exploding Shuriken.
- Tank Top Tiger gets punched by Saitama during the Meteor Arc and Tank Top Black Hole has his hand crushed by Saitama begging for mercy.
- Tank Top Master felt weak when Tatsumaki was able to pick up thousands of rubble pieces right after Tank Top Master threw one himself. He felt the same way again after Metal Knight came back to rebuild A-City.
- Tank Top Vegetarian got pummeled by Garou, and then punched in the face again by Garou.
- Tanktop Master was defeated and hospitalized after Garou adapted to his movements and began using his Water Streaming Rock Smashing Fist.
- Then Garou used Water Streaming Rock Smashing Fist to beat up the remaining members of the Tank Top Army.
- Despite being beaten up and humiliated they're still one of the strongest factions of the Hero Association.