The Fire Flower is a powerup that is frequently used by Mario, Luigi and Wario while having a Super Mushroom state active. It gives the user the ability to shoot fireballs. In Mushroom Kingdom Fusion, it provides a general power-up to the user.
- Mario turns into Fire Mario and throws fireballs that bounce along the ground. Classic Mario and Classic Luigi's fireballs behave the same.
- Luigi turns into Fire Luigi. He also throws fireballs, but his fly straight without being affected by gravity, like in the Super Smash Bros series. However, they do not travel as far.
- Wario will gain his Dragon Hat to use as a short range flamethrower. It can rack up multiple hits fast, but wears out after an extended period of time.
- Waluigi will become Strikers Waluigi. He can kick a soccer ball from the Mario Strikers series as a projectile.
- Sonic and Tails will gain the Fire Shield from Sonic 3 & Knuckles and Sonic 3D Blast. It is resistant to fire-based projectiles, and enables them to perform a fire dash ability in mid-air. For Sonic, this will disable his Insta-Shield ability.
- Link will gain a random weapon from his arsenal of weapons.
- Arthur will gain a random weapon from his arsenal of weapons.
- Roll, Proto Man and Mega Man will gain a random robot master weapon. These are dependent on an ammo meter.
- Simon will gain a random sub-item to go along with his whip.
- Ryu will gain one of his sub-items.
- Samus will gain a missile tank. This will give her 5 missiles while also increasing her max missile count by 5, up to a maximum of 35.
- Legacy Link will become Boomerang Link. Link fires two boomerangs, one magical with greater reach and power and the other plain, and they will fly back if they don't hit an enemy. Both of them can be aimed.
Standard | Super Mushroom | Fire Flower | Raccoon Leaf | Hammer Bros. Suit | Tanooki Suit | Blue Shell | |
Crossover | Sci-Fi Suit | Mega Man Suit | Soldier Suit | |
Other | 1-Up Mushroom | 3-Up Moon | Poison Mushroom | Starman | Lil Reaper | Stomp Boots | Life Energy | |