Elemental effects:
-Burning/flame effect causes you to take 1% damage every half second or so
From things like: PK Fire, bomb detonations, Falcon Punch, Din's Fire, Flare Blade
-Freezing/cold effect slows down your movement speeds and increases attack lag
From things like: FLUDD, Surf, Blizzard, Ice Climber ice pieces
-Dark/poison/curse causes you to take more damage from incoming attacks
From things like: Wizard Kick, Wario fart, Luigi final smash, Mewtwo's glowing attacks
-Lightning/shock effects that have a lot of hitstun
From things like: PK Thunder, Lightning Jolt, Screw Attack
-Wind effect that increases character floatiness and makes jumps higher
From things like: Gale boomerang, Phantasm, Reflect
-Earth/heavy effect that deals lots of shield damage and shield stun, and increases dizzy time of the enemy if used to break a shield
From things like: DK Headbutt, Rock Smash, Pound, Ike forward smash