Brass is a fictional mutant

Mutant (Marvel Comics)

In comic books published by Marvel Comics, a mutant is an organism who possesses a genetic trait called an X-gene that allows the mutant to naturally develop superhuman powers and abilities...

 character in the Marvel Comics

Marvel Comics

Marvel Worldwide, Inc., commonly referred to as Marvel Comics and formerly Marvel Publishing, Inc. and Marvel Comics Group, is an American company that publishes comic books and related media...

 Universe. His first appearance was in Marvel Comics Presents

Marvel Comics Presents

Marvel Comics Presents was an American comic book anthology series published by Marvel Comics originally from 1988 to 1995; it returned for a second volume in 2007-2008.-Volume 1:The first volume was released on a biweekly basis and lasted for 175 issues...

#65.

Fictional character biography

Brass is the son of Yuji Watanabe, the karate tutor of Ghost Rider

Ghost Rider (Daniel Ketch)

Ghost Rider is a comic book character, a supernatural superhero in Marvel Comics' main shared universe. He is the third Marvel character to use the name Ghost Rider, following the Western hero later known as the Phantom Rider, and Johnny Blaze, the first supernatural Ghost Rider.-Publication...

's alter ego, Dan Ketch. An expert martial artist, Sean was trained by his father as soon as he could walk as a child. Sean then joined the Navy and trained as a commando operative in the United States Navy SEALs

United States Navy SEALs

The United States Navy's Sea, Air and Land Teams, commonly known as Navy SEALs, are the U.S. Navy's principal special operations force and a part of the Naval Special Warfare Command as well as the maritime component of the United States Special Operations Command.The acronym is derived from their...

 which is where he earned the nickname "Brass".

After leaving the Navy, Sean met a girl named Theresa and fell in love, but she was accidentally killed by a car attempting to escape an attack by the Mandarin

Mandarin (comics)

The Mandarin is a fictional character, a Marvel Comics supervillain and the archenemy of Iron Man.In 2009, Mandarin was ranked as IGN's 81st Greatest Comic Book Villain of All Time.-Publication history:...

 on the Avengers

Avengers (comics)

The Avengers is a fictional team of superheroes, appearing in magazines published by Marvel Comics. The team made its debut in The Avengers #1 The Avengers is a fictional team of superheroes, appearing in magazines published by Marvel Comics. The team made its debut in The Avengers #1 The Avengers...

. Sean learned that the Mandarin had been working with other villains as part of the "Acts of Vengeance

Acts of Vengeance

"Acts of Vengeance" is a comic book crossover storyline that ran through several titles published by Marvel Comics from December 1989 to February 1990.-Publication history:...

", and swore revenge on all the villains that had taken part.

He began by hitting the Mandarin's operations in Chinatown, and ended up aiding Wolverine

Wolverine (comics)

Wolverine is a fictional character, a superhero that appears in comic books published by Marvel Comics. Born as James Howlett and commonly known as Logan, Wolverine is a mutant, possessing animal-keen senses, enhanced physical capabilities, three retracting bone claws on each hand and a healing...

 and Ghost Rider in rescuing his father's other pupil, Jack D'auria, from Deathwatch and his ninja forces.
Brass lost his mutant powers after the M-Day

Decimation (comics)

Decimation is the late 2005 Marvel Comics storyline spinning off from the House of M limited series. It focuses on the ramifications of the Scarlet Witch stripping nearly all of the mutant population of their powers, thereby reducing a society of millions to one of scant hundreds.This event, which...

.

The Initiative

Sean is being considered as a "potential recruit" for the Initiative

Avengers: The Initiative

Avengers: The Initiative was a comic book series from Marvel Comics. Written by Dan Slott and Christos Gage with artwork initially by Stefano Caselli, Steve Uy and Harvey Tolibao, the series dealt with the aftermath of Marvel's Civil War crossover Avengers: The Initiative was a comic book series...

 program, according to Civil War: Battle Damage Report.

Powers and abilities

He is an expert martial artist and was a low-level telepath who could read the thoughts to anticipate his opponent's moves.

Other Marvel characters named Brass

Watanabe isn't the only character to be called Brass. These include:

• Selbert, a member of Project: Glamor (an attempt to re-create the Super-Soldier Serum
  Captain America
  Captain America is a fictional character, a superhero that appears in comic books published by Marvel Comics. The character first appeared in Captain America Comics #1 , from Marvel Comics' 1940s predecessor, Timely Comics, and was created by Joe Simon and Jack Kirby...
  
  ) was known as Brass up until he was killed by Railsback. He first appeared in Marvel Comics Presents #1 and was killed in #12.
• In Iron Man vol. 1 #330, a large robot controlled by Morgan Stark
  Morgan Stark
  Morgan Stark is a Marvel Comics character who was the cousin and rival of Tony Stark.-Fictional character biography:Growing up, Morgan Stark believed that his uncle cheated his father out of the Stark company fortune. In truth, Edward asked Howard to be bought out—he didn’t want a part in the...
  
  was known as Brass.