The character was created by Paul Neary and developed by writer Graham Marks, with initial designs by Gary Frank (Supreme Power, The Incredible Hulk).

Motormouth ran for 12 issues, with Harley and later her partner Killpower going to various alternative realities from the regular Marvel Universe.

Harley is orphaned at age 11 and grows up as part of a gang that lives in the East End of London.

While the two fight, Motormouth and Tuck (Death's Head's partner) go on a shopping spree on an alien planet.

Harley is able to steal their MOPED unit and neutralize the tracking devices Mys-Tech has implanted in the duo.

A fortunate fall from Killpower allows six heroes, Motormouth included, to break free of the melee and patch themselves into the required equipment so they can save the Earth from destruction.

Motormouth ends up simply sitting in the sixth chair to fill out the required number of entities.

[7] In the Dark Guard mini-series, both Motormouth and Killpower are recruited by the Time Guardian to help stop a war on the planet Eopia.

[9] Motormouth and Killpower come under the attention of Nigel Orpington-Smythe, leader of the R.C.X., a British intelligence agency, in the comic book Excalibur.

Security footage stills of the two are shown to Captain Britain as an example of the lawless vigilantism that Smythe seeks to control.

[10] Issue #12, the last of the series, features Motormouth visiting a homeless encampment on the south side of the River Thames in London, England.

Motormouth versus Removal Man was partially drawn and had her fighting a Mys-Tech assassin who made his targets never exist in the first place (boasting one of his finest jobs as the Fantastic Five).

[14] Harley was left depressed and quit MI:13, living instead on a council estate in London, where she was known for her work fighting the vampire invasion.

She became the single mother to two children, Victoria and Albert (named after pubs), and every so often she'd be attacked by (and kill) a former Mys-Tech monster who thought she was an easy target.

To Harley's shock, it turned out Hell's leader was a transformed Killpower who had been manipulated by Mephisto into believing she abandoned him.

Working with other heroes to protect an enclave of innocent people, she steps up to battle a wave of Sentinels, only to be killed by them.

Harley can create deafening sounds and force blasts by screaming or shouting, similar to the X-Men's Banshee or DC Comics' Black Canary.