Flame Attack

Flame Attack is a type of sticker power-up that adds damage to flame-based attacks, such as PK Fire.

Characters who can use flame in their attacks

Mario - Forward Smash, Fireball
Luigi - Fireball, Fire Jump Punch, Green Missile
Bowser - Fire Breath
Diddy Kong - Rocketbarrel Boost
Zelda - Din's Fire, Farore's Wind (upon re-appearing)
Sheik - Vanish
Ganondorf - Volcano Kick
Samus - Down Tilt, Forward Air, Up Smash
Zero Suit Samus - Plasma Whip (very end of the wire)
R.O.B. - Down Air, Back Air, Neutral Air, Up Smash, Robo Beam (right next to his eyes)
Kirby - Can use fire if he swallows a character with a fire attack as their neutral special move
King Dedede - Jet Hammer
Olimar - With red Pikmin, Olimar's Forward Smash, Up Smash, Down Smash, Up Air, Back Air, Down Air, Forward Air, and Pikmin Chain will all have incendiary properties if the red Pikmin is first in his entire line-up.
Fox - Fire Fox
Falco - Fire Bird
Captain Falcon - Forward Smash, Falcon Punch, Falcon Dive, Falcon Kick, Raptor Boost
Charizard - Flame Thrower, Back Air (the second part, which must be sweetspotted), Forward Air, Down Throw
Ike - Eruption
Ness - PK Fire, Down Throw
Lucas - PK Fire
Mr. Game & Watch - Forward Smash, Chef (a character is burned if they make contact with the pan itself), Judgment (number 6)