Hotheads made their debut in Super Mario World as castle level enemies and has become a recurring enemy in the Mario and Yoshi series. They are large balls of sparkling energy with simple eyes. Hotheads are known for simply moving along platforms and being immune to every attack, except for Invincible Mario.
In its stationary state, Hotheads can be picked up and thrown by the player's fighter, but will become mobile when thrown. Once they land on the ground or on a platform, it will move along the surface in the direction it was thrown, clinging to the floors and the ceilings of said platforms, and periodically release sparks, which are almost twice as strong as when they are thrown at the same size. In Ultimate, Hotheads appear to change their direction when they travel offstage on flat surfaces instead of disappearing; 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 can also be attacked, causing them to grow larger. It can be attacked both before and after setting it in motion. In Brawl and Smash 4, this was possible through flame and electric attacks, but in Ultimate, any attack can increase their size. Hotheads can reach their maximum size of roughly three times its original diameter after taking approximately 30% damage, despite its Brawl trophy description; however, if it is undamaged and takes more than 30% damage at once, it can gain OHKO power.
Hotheads eventually disappear in an amount of time inversely proportionate to their size (e.g., the bigger ones vanish faster). A traveling or thrown Hothead can be reflected, which will change its ownership and reverse its direction of travel.
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.
The Hothead trophy appears in both versions.
The Hothead also appears as a Novice-class support spirit.
The Hothead uses a Curry Pac-Man puppet fighter and is fought on the Mushroom Kingdom U stage's Slide Lift Tower layout. During the battle, the Hothead appears as the item while Pac-Man starts off with a Hothead.
In addition to the above, equipping the Plasma Wisp or Zip support spirits will give the player a Hothead at a start of their stock.
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