Fireball

Fireballs are small projectiles launched by Mario, Luigi, Baxter and Gunther as there Standard Special Moves. Each travel a short distance of time, causing minor damage and flinching fire based attacks. The fireball is officially not big at all but it is the same size in SSBM & SSBB, Kirby can also use the fireball move if he sucks each Brother from mario and baxter.

Mario
Mario's Fireballs all from the ground, losing momentum in each bounce. As much Mario's fireballs are more effective when launched. Mario's fireballs can be spammed at any point and anytime. If Mario fires it at a wall or upward slope, the red fireball gets knocked back.

Luigi
Luigi's Fireballs travels in a Straight line and are uneffective by Gravity. Luigi's fireballs are faster & easily spammed if Luigi uses Negative Zone for the Final Smash. If luigi's green fireballs touch a wall or an upper slope it disapears.

Baxter
Baxter's Fireballs are Chargeable, it can be charged & can be used for later use, If Baxter shoots an uncharged fireball, it's a very fast fireball that dosen't hit the ground, it's fast like a bullet, If fully charged, Baxter can shoot a Fire Orb from instead but it's slow & deals with heavy damage.

Gunther
Gunther's Fireballs swoopes up in the air & comes back down, it's an ariel move which can be dodged easily. it was said that Gunther's fireballs are the weakest.