Tremolo 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 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...

' shared universe

Shared universe

A shared universe is a fictional universe to which more than one writer contributes. Work set in a shared universe share characters and other elements with varying degrees of consistency. Shared universes are contrasted with collaborative writing, in which multiple authors work on a single story....

, the Marvel Universe

Marvel Universe

The Marvel Universe is the shared fictional universe where most comic book titles and other media published by Marvel Entertainment take place, including those featuring Marvel's most familiar characters, such as Spider-Man, the Hulk, the X-Men, and the Avengers.The Marvel Universe is further...

.

Fictional character biography

Tremolo was a member of female 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...

 terrorists. She was resuscitated by Cyber

Cyber (comics)

Cyber is a fictional comic book supervillain appearing in books published by Marvel Comics, usually as an enemy of Wolverine of the X-Men. Created by writer Peter David and artist Sam Kieth, he first appeared in Marvel Comics Presents #85 , though his appearance was obscured by a trench coat and hat...

 to commit acts of extortion

Extortion

Extortion is a criminal offence which occurs when a person unlawfully obtains either money, property or services from a person, entity, or institution, through coercion. Refraining from doing harm is sometimes euphemistically called protection. Extortion is commonly practiced by organized crime...

, and worked for a notorious drug cartel

Drug cartel

Drug cartels are criminal organizations developed with the primary purpose of promoting and controlling drug trafficking operations. They range from loosely managed agreements among various drug traffickers to formalized commercial enterprises. The term was applied when the largest trafficking...

. A other member of group, Shrew

Shrew (comics)

Shrew is a fictional character, a mutant in the Marvel Comics Universe. Her first appearance was in X-Factor vol. 1 #80.-Fictional character biography:...

 eventually quit the team and agreed to testify against the cartel for immunity. Tremolo and other The Belles, upon discovering their former teammate's betrayal, sought out to kill Shrew. The government then placed Shrew under the protection of X-Factor

X-Factor (comics)

X-Factor is an American comic book series published by Marvel Comics. It is a spin-off of the popular X-Men franchise, featuring characters from X-Men stories. The series has been relaunched several times with different team rosters, most recently as X-Factor Investigations.X-Factor launched in...

. The Belles ambushed X-Factor in a hotel, and in the ensuing battle. She was initially driven off by Wolfsbane, and was later punched out by Quicksilver and taking them into custody with other defeated Hell's.

She is currently depowered due to events of M-Day.

Powers

Tremolo radiates sound and sonic waves around her body at all times, allowing her to fly, giving off explosive shock blasts, and vibro-shattering anything within range.