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Nekketsu is a samurai monster teacher with a whole lot of attitude, sent by Nightmare Enterprises to deal with Kirby since Mr. Chip isn't up to doing anything to harm his students. He appears in the episode Teacher's Threat. Being a samurai, Nekketsu is shown to be skilled in swordplay, most notably that of any other samurai, and is also shown to be able to stretch his arms, too. After appearing from within a smoke bomb that King Dedede had carried back to the Dedede Academy school with him and then whacking Kirby around a bit with his bokken, Kirby sucked up Nekketsu's bokken and became Sword Kirby. Nekketsu brought out a sword similar to the Beam Sword item in the Super Smash Bros. series, and the two engaged in a sword duel. Kirby eventually ended the duel with two Sword Beams - the first time he used a Sword Beam, Nekketsu was able to block it, but the second time, the evil substitute teacher's attempt was futile. He was effortlessly sliced in half and destroyed, with the entire Dedede Academy school crumbling with him.
Nekketsu is a very humanoid-looking creature. He has gray hair and gray eyebrows, and he has sunken-in yellow eyes. His gray hair is held back by a bandana with red, black, and white colorings that run along it in a zigzag pattern. He wears an evil grin on his face (which looks similar to early Shonen Jump faces), and his mouth is large and full of pearly white teeth. He wears blue shoes and is very well-dressed, wearing a pink shirt with a green necktie and a purple tuxedo over his pink shirt, and he wears white gloves. A red yin-yang is painted on the back of his tuxedo. Nekketsu comes complete with a bokken that he can whack anything and anyone with, as well as a blue energy sword with a golden handle, which resembles the Beam Sword item in the Super Smash Bros. series.
- Nekketsu is one of the few monsters that are anonymous in the English dub, other examples being the Martial Arts All-Stars and Hardy.
- Nekketsu's overall body design bears a resemblance to that of NME Salesman.