Red-Brief J
Red-Brief J was a boss that resembled an anthropomorphic bull. He was found in the game Wario World. At the end of Beanstalk Way, after beating Spideraticus, this large bull revealed himself.
Red-Brief J had the largest variety of attacks of any of the bosses in the game. First and most common, he would charge up red energy and charge toward Wario. As the fight went on, he would add one charge for every health skull he lost.
Secondly, when summoning purple energy, he would jump up and crash down, dunking the entire arena into the lava. Wario had to stay on the raised, middle section to dodge it.
In his third attack, Red-Brief J would jump, hover in the air, and dive at Wario extremely fast. This attack is usally followed by an attack where he fires multiple fireballs at Wario from his hoof.
Red's final attack type is when he draws in pink energy. He begins to twirl like a ballerina toward Wario. The attack has an insane homing ability, so it's tough to dodge.
To defeat the bull, who was invulenerable to Wario's punches, Wario had to wait for Red to do one of his huge charges. If dodged just right, the hulking bull would lose control and end up teetering on the edge of the arena over a pool of lava. When this happened, Wario immediately Ground Pounded the middle of the stage, causing Red-Brief J to fall off and become well-done steak.
This might be the only boss in the game that has official artwork.