Hotheads (パサラン, Pasaran) are items that, when thrown, will slide across the ground releasing bursts of sparks and damaging opponents of the thrower. When hit with attacks of the fire or electric effects, they grow bigger, dealing more damage and knockback. However, in contrast to what its Brawl trophy says, there is an upper limit to how large the Hothead can become (roughly three times its original diameter).
In Super Mario World, Hotheads were enemies that appeared inside Wendy Koopa's Castle in World 6, Chocolate Island. This level largely consisting of stone blocks, which had Hotheads constantly moving around them. Unlike those in Smash, they were not enlarged by fire and they never disappeared, though small and large versions of the enemy appeared together.
In a Hothead's initial state, it is an item that can be picked up and thrown. It can also be attacked, and if it is attacked by fire or electric attacks, it will grow larger. It activates when thrown, and once the Hothead lands on the ground or a platform, it will move along the surface in the direction it was thrown and periodically release sparks, which are almost twice as strong as a smash-thrown Hothead of the same size. While it is travelling, a Hothead can still be hit by attacks and grow larger.
If it is thrown onto solid terrain, the Hothead will cling onto the surface, travelling along the walls or ceilings. However, if it is on soft terrain, the Hothead will fall off of the edge, and continue to fall until it lands again (or falls off the screen). Hotheads eventually disappear in an amount of time inversely proportionate to their size (that is, bigger ones vanish faster). A travelling or thrown Hothead can be reflected, which will change its ownership and reverse its direction of travel.
A Hothead will reach maximum power after it takes approximately 30% damage. However, if the Hothead is undamaged and hit by a fire or electric-based attack that deals over 30% damage (such as Ike's Eruption), its power can exceed this limit and gain OHKO power. This can be taken to ludicrous extremes, such as knocking five Soccer Balls into a Hothead using Marth's Critical Hit (only in Training Mode is this plausible), causing the Hothead to deal 140% damage or more and become impossible to reflect.
In Ultimate, Hotheads appear to change their direction when they travel offstage on flat surfaces instead of disappearing. They also can grow larger from any attack, and may even gain OHKO potential from strong enough attacks.
Note: All of these damage percentages were taken with an uncharged Hothead.
An item that, when tossed, sticks to the terrain and moves, causing damage to those it touches. Whoever threw it won't take damage. It will grow larger if it's attacked, which ups its attack range. However, an increase in size corresponds to a decrease in the time it stays on the screen. A really big Hothead will take up the entire screen, and is quite a sight to behold.
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