Bully

Bullies, or Viking Bombs, are a race of creatures introduced in Super Mario 64. They are first found in Lethal Lava Land in Super Mario 64 and its remake, Super Mario 64 DS, and have since become recurring, albeit occasional enemies in the Super Mario series. Their name and design are based on the word 'bully', referring to their aggressive behavior, and a 'bull', referring to their horns and charging attack pattern.

Super Mario 64 / Super Mario 64 DS
In Super Mario 64, Bullies are a black sphere with green feet, angry eyes and two yellow bull horns. They appear in Lethal Lava Land and the second Bowser level, Bowser in the Fire Sea. Bullies are usually found on platforms and sometimes in groups. Bullies try to charge into Mario to knock him off the platform and into the surrounding lava. They always move in the direction that Mario is facing. Mario does not take damage if he is hit by a Bully. He can defeat a Bully by knocking it into the lava, which can be done by either by kicking, punching, Ground Pounding, or diving at it. After the Bully sinks into the lava, it relinquishes a coin, which is tossed onto the platform.

Bullies have a larger variant known as Big Bullies. Two of them are respectively encountered in the first two missions of Lethal Lava Land. In the second mission, Bully the Bullies, Mario must first defeat three Bullies before he can fight the second Big Bully.

In Snowman's Land, there is a similar enemy known as a Chill Bully. It resembles the Bullies because it has a round, icy body, one gold horn on their head, and green shoes.

In Super Mario 64 DS, Yoshi can push back the Bullies by stomping on them. Bullies also appear in Chief Chilly Challenge, where they try to push Luigi into a bottomless pit.

Super Mario 3D World
After a nine-year absence, Bullies reappear in Super Mario 3D World. However, their appearance has changed: they are now made of a blue shiny metal, their horns are golden and are bent forward with dark stripes at the base, and they appear larger than their previous incarnations. Also, they have rims just above their feet and red eyes. They no longer grunt, and make a metal sound when jumped on. They once again charge at the player, and can be knocked back by jumping on them, using projectiles like fireballs, or tapping them on the GamePad. Bullies will pause and teeter when pushed to the edge of a platform, giving the player time to land the final hit. If they are not knocked off, they will regain their balance and continue charging at the player.

Bullies can also be defeated by using the Lucky Cat Statue. A new boss, Prince Bully, also appears in this game.

Super Mario Maker 2
Bullies appear in Super Mario Maker 2 as enemies exclusive to the Super Mario 3D World theme. If a Bully has wings applied to it, it can fly out of a pit if knocked off a ledge.

Mario & Luigi: Paper Jam
Bullies appear in Mario & Luigi: Paper Jam as an enemy, making this their first appearance in an RPG. They are only encountered at Mount Brrr and retain their physical appearance from Super Mario 3D World. Their main attack is ramming Mario, Luigi, or Paper Mario, who must counter it with the hammer. Occasionally, bombs will appear behind the bros., and they must jump on the Bully while it is charging in order to not get pushed into the bombs. If Paper Mario jumps over the Bully while it is charging, it will run into the bombs, causing it to explode and take damage.

Bullies make a minor appearance in the end credits where several of them attempt to ram into the Papercrafts alongside some Broozers and Mechakoopas in the Bowser's Castle portion.

Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey
In Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey, Bullies make an appearance in the Bowser Jr.'s Journey mode, where they are enemies and recruitable allies. They are Melee troops, and their Special Skill is Smack Back Attack.

Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey

 * Bowser Jr.'s Journey profile: The go-to blokes for a strong frontal offense. Their specialty is to push through their foes using their heavy bodies.

Trivia

 * According to Super Mario 64 source assets, its early name is Otos. This suggests a relation to a removed enemy known as Motos.
 * Models for Bullies are unused in Super Mario Galaxy. Similar to Super Mario 64 and Super Mario 64 DS, their bodies are made of a flat texture showing a picture of a black sphere, instead of a fully-modeled sphere.