Rock Bison

Antonio Lopez  is Kotetsu T. Kaburagi's best friend and fellow Veteran Hero. His bull-themed costume includes advertising for Japanese barbecue restaurant chain Gyu-Kaku.

Personality
Antonio is tough and usually confident. However, he is often bothered by the fact that he is last in the rankings and by his declining popularity. He is often the butt of jokes as a result. He tends to be stubborn, but is caring and very loyal. He enjoys bragging about his power and does whatever he can to earn a name for himself. At one point he becomes so worried and desperate he copied his fellow heroes' schticks. He is a bit younger than Kotetsu.

History
Little is known about Antonio's past prior to the series.

He grew up in a small town near Kotetsu's hometown. For a while in high school he was the leader of a small gang.

Kotetsu T. Kaburagi
Antonio has known Kotetsu since high school and the two are very close. Antonio heard rumors that Kotetsu was very strong, so sought him out to challenge him to a fight to see who is stronger. Not interested in fighting him, Kotetsu tried to avoid Antonio until a member of Antonio's gang kidnapped Tomoe. When Antonio found out about the kidnapping he teamed up with Kotetsu to rescue Tomoe, and the two became best friends soon after.

Occasionally they will argue and decide to finish the fight to see who is stronger, declaring that whoever wins will be the winner of the argument as well. However, something always interrupts them before they can finish and determine a winner.

When Kotetsu has problems, he occasionally goes to Antonio for advice. When half the heroes were sent to the hospital by Jake Martinez, he could tell that Kotetsu was still injured while the others thought he had completely healed with his Hundred Power.

Abilities and Powers
Antonio has the ability to harden his skin, making him impervious to physical attacks. However, even alongside Blue Rose and Sky High, he is unable to stop the ice rink from falling, meaning his strength is limited to some extent.

Costume
Rock Bison's costume/armor gives him the appearance of a bull. He is given the nickname "Bull Tank of the West Coast" because of how he charges through enemies using his thick horns or giant drill shoulders. The drills are functional, and he has been shown to use them to navigate slightly in the air after being launched from his transport vehicle.

HeroTV Communicator
Like all the Hero TV heroes Antonio wears a simple "communicator" wristband which Agnes can use to contact him, usually to inform him of a crime being committed. The other heroes can also use it to contact him. Antonio's communicator is white with brown bands around the edges.

from Tiger & Bunny - The Rising - King of Works

 * He lives in Sternbild's Bronze Stage.
 * His strong points are that he has good hand dexterity, is softhearted, and is unexpectedly frugal.
 * His weak point is sweet things.
 * His favorite food is meat.
 * His least favorite food is sweets.
 * He's good at Judo, carrying luggage, calm self-analysis, identifying the other heroes by their footsteps.
 * His weaknesses/dislikes are too much women and giving gifts that the other party will be pleased with.
 * His hobbies are sewing and drinking and socializing with peers.
 * His future goals are to be #1 in Hero rankings and to get married and have children.
 * His motto is "There are as many women as there are stars, but we cannot reach the stars."
 * He writes back to his fans who send him letters.
 * He likes to watch the night sky.

Miscellaneous

 * His picture on Kotetsu's phone is that of an African buffalo.
 * He and Kotetsu are the only known heroes to have known each other before becoming heroes.
 * There is a similar hero in the manga "Ratman"
 * Like many of the heroes in the series, his powers are similar to those of a Marvel  superhero. Antonio's powers are similar to those of Luke Cage.