Hammer Bro

Hammer Bros. are enemies from the Mario franchise, and they are Koopas who throw hammers at other characters. Their first appearance in a Super Smash Bros. game is Super Smash Bros. Brawl (not including the first two games, where they only cameo in the background of each game's Mushroom Kingdom stage). A Hammer Bro appears as an Assist Trophy in every Super Smash Bros. game from Super Smash Bros. Brawl onward.

Background information
Hammer Bros. first appear as enemies in the Nintendo Entertainment System game, Super Mario Bros. and would appear in most later Super Mario 2D installments. In the games, Hammer Bros. attack Mario or Luigi by throwing hammers at them. Hammer Bros. can jump high, allowing them to reach a higher platform before dropping back to the platform or ground beneath.

On July 2, 2007, the Smash Bros. DOJO!! revealed Assist Trophies and a Hammer Bro as one of their characters for the then-upcoming Super Smash Bros. Brawl. The post has three screenshots, all of which take place in the Delfino Plaza stage, that demonstrate the use of an Assist Trophy. The first image shows Kirby holding up an Assist Trophy, then the second image shows a close-up of a Hammer Bro, and the third screenshot shows that Hammer Bro throwing a hammer at Fox.

Super Smash Bros. Brawl
In Super Smash Bros. Brawl, aside from being an Assist Trophy, Hammer Bros. are enemies in some The Subspace Emissary levels, in order of The Jungle, The Lake, The Cave, The Swamp, and lastly The Great Maze. Hammer Bros. are the only character in Super Smash Bros. Brawl to be both an Assist Trophy and an enemy in The Subspace Emissary. In the opening cutscene of The Jungle, a Hammer Bro is seen loading bananas onto the cargo. The Hammer Bros. in The Subspace Emissary act the same as their Assist Trophy counterpart, but can be attacked and defeated. The player earns 500 points for each Hammer Bro that their fighter defeats.

There is a Hammer Bro sticker, which reuses its New Super Mario Bros. artwork. There is also a Hammer Bro trophy, which mentions New Super Mario Bros. as one of its appearances. The Hammer Bros. were designed after their New Super Mario Bros. appearance and other Mario spinoff titles released around that time.

Super Smash Bros. for Nintendo 3DS / Wii U
In Super Smash Bros. for Nintendo 3DS and Super Smash Bros. for Wii U, Hammer Bros. return as an Assist Trophy. Opponents can now attack a Hammer Bro, like in the previous game's Adventure Mode: The Subspace Emissary, and doing this enough times defeats the Hammer Bro, causing it to flip upside-down and fall off-screen, just like how they are defeated in Super Mario Bros.. The same trophy of Hammer Bro also appears in both games.

In the Smash Run mode of Super Smash Bros. for Nintendo 3DS, Hammer Bros. return as an enemy. They retain a similar behavior, although like with many other enemies, defeating the Hammer Bro causes it to bounce around several times before disappearing.

Super Smash Bros. Ultimate
In Super Smash Bros. Ultimate, Hammer Bro returns as an Assist Trophy again. It is also featured as an Advanced-class Grab-type primary spirit, which depicts its New Super Mario Bros. U artwork, and grants the user slightly increased jump height. In the corresponding spirit battle, the player has to fight Yoshi on the Golden Plains stage, and the Hammer Bro Assist Trophy appears when the opponent is highly damaged.

The core extracted from a Hammer Bro spirit can be used with a Reporter & Wrestler core to summon Masked Dedede's spirit.

Super Smash Bros. for Nintendo 3DS / Wii U tips

 * Nintendo 3DS: "Hammer Bros. won't move from side to side, so you can move around them and out of range."
 * Wii U: "The Hammer Bro won't move from side to side, so you'll be safe as long as you stay out of range."