Bombchu

Bombchus (, Bombchu) are items from series. It appears in Super Smash Bros. 4 and in Super Smash Bros. Ultimate as an item.

Origin
The Bombchu first appeared in  and have appeared in Majora's Mask, Oracle of Ages, Oracle of Seasons, Phantom Hourglass, and Hyrule Warriors. In Ocarina of Time and Majora's Mask, Bombchus move forward, crawling up walls and even ceilings, and explode upon impact on an enemy or obstacle, or after a period of time. In Oracle of Ages and Oracle of Seasons, they lock onto an enemy and follow it if there is one present. In Phantom Hourglass, Bombchus follow a given path made by the player. Bombchus in Super Smash Bros. 4 are based off the Bombchus in Ocarina of Time and Majora's Mask as it only moves in one direction.

Etymologically, its name is composed of bomb and chu, Japanese onomatopoeia for a mouse's squeak.

In Super Smash Bros. 4
Bombchus appear as a throwable item. Once thrown, Bombchus will keep going at a straight path, traveling over walls and ceilings like a Hothead, and explode upon impact on an opponent; it will pass through the player that used it however. It travels faster over time; if kept for too long, it will start flashing, then explode which can also damage the player who threw it. It will always do 18% damage, regardless of how it is thrown. It does knockback towards the Bombchu's direction.

In Super Smash Bros. Ultimate
In Ultimate, Bombchus change their direction when they travel offstage on flat surfaces instead of disappearing, which is a change that Hotheads also have. Like all explosives, directly thrown Bombchus no longer harm the thrower, but it can still harm the user once it starts rolling.