Hot Foot

A Hot Foot (plural: Hot Foots or Hot Feet) is a Lava Bubble-like creature, making its first game appearance in Super Mario Bros. 3.

Super Mario Bros. 3
In Super Mario Bros. 3 and its related remakes, Hot Feet inhabit the candles of fortresses, first appearing in the first fortress level in Giant Land. A Hot Foot's behavior is similar to Boos': If Mario or Luigi looks at one, it will stand still, and if they look away, the Hot Foot will resume walking towards them. Unlike Boos, Hot Feet can only move along the ground. Hot Feet can only be defeated by Hammer Mario's hammers or touching it while invincible.

The Adventures of Super Mario Bros. 3
A single Hot Foot makes an appearance in The Adventures of Super Mario Bros. 3, in the episode "Princess Toadstool for President", where it leaps off of its candle and chases after Mario and Luigi for a brief time.

Nintendo Adventure Books
In the Nintendo Adventure Book Koopa Capers, a large number of Hot Feet appear guarding a coin-filled cave Luigi can find in the Magma Pits. After Luigi collects some of the coins, the Hot Feet will chase him, into either a Fire Chomp (leading to a Game Over) or a door leading to a chamber filled with Fire Snakes. Referencing the confusion over the plural version of their name, Luigi is unable to decide on whether or not to call them Hot Feet or Hot Foots.