This article/section contains information pertaining to unused content from games and similar media. This means it was never implemented into the game or was removed, cut or altered at some point of its development, and this article pertains to its original implementation.
Mario uses a Fire Flower to become Fire Mario, infusing his attacks with fire.
Fire Mario (ファイアマリオ) was originally Mario's Final Smash in Super Smash Flash 2. He would acquire this form by absorbing the power of a Fire Flower, infusing his attacks with fire and making him stronger and faster. In addition, many of Fire Mario's moves were cancellable. Fire Mario was one of the many Final Forms in the game, which means that he had a different and more powerful moveset than normal Mario. As of v0.9b of the Super Smash Flash 2 Demo, this form has been replaced with a revamped Mario Finale.
Prior to v0.5a of the SSF2 Demo, Fire Mario used a completely different sheet. His standard combo was a seven-hit beat-down and all of his special moves were completely different. The Super Fireball did not release the Mario Finale at full charge (though he released a mini-version of the attack), his side special move was the Heat Shield rather than the Golden Cape and his down special move was the Fire Mario Eruption rather than the Firewall Tornado.
Out of all of the removed content throughout the demos, Fire Mario has proven to be the most controversial. Fans commonly request his return, complaining that his absence detracts from SSF2's individual identity and makes it too much like a clone of Super Smash Bros. Brawl. Despite these complaints, the developers have stated that he will not be returning.