Firefly (DC Animated Universe)

Firefly was a fire-starting criminal. He appeared in The DC Animated Universe several times,voiced by Mark Rolston.

Batman:The Animated Series
Garfield Lynns was a special effects and pyrotechnic expert that worked on the road with the pop music artist, Cassidy. Lynns nursed a love for Cassidy. Her flirtatious behavior only fueled Lynn's obsession. After a date or so, Cassidy and Lynn's relationship became strained. Cassidy then finally decided to lay off Lynn after she opened for Gotham's Rock City nightclub. Lynns overrode the pyrotechnic displays and fled the scene. In secret, Lynns worked on an insulated battle suit capable of flight and took the name, Firefly.

He used his cache of flash caps, napalm accelerators and smoke bombs, as well as a rig that generates a blade-like flame. Intent on fleeing Gotham with Cassidy, Firefly decided to use an experimental gel, of his creation. The gel was capable of burning through anything and he planned to flood it into the sewers and burn all of Gotham in one swoop. However, Batman intervened and stopped Firefly. Soon after, Firefly, out of prison, began to contract out as an arsonist for hire in Gotham. After the fire was set, his clients would commit insurance fraud and profit heavily. The local newspapers documented them as 'mystery arsons' and caught the attention of three young children who mistook the shadowy figure in the picture as Batman. The children followed Firefly to one of Gotham's theater and witnessed Batman's arrival. He saved the children and stopped Firefly again.

Justice League
Some years later, due to prison overcrowding issues at Stonegate Penitentiary, Firefly was transferred to Stryker's in Metropolis. A prison riot soon after, allowed several super villains to escape. Firefly was paired with Volcana, with whom he shared a casual interest in. The super villains caught the attention of the Justice League. Batman and Green Lantern John Stewart arrived to confront the pair as Volcana attacked a Metropolis Special Crimes Unit detachment. Stewart trapped Firefly and Volcana in a ring construct in an effort to render their namesakes useless. However, both fought anyways and exhausted the trapped oxygen. Firefly and the rest of the super villains were recaptured and returned to Stryker's.