Waiu is a rather extremely obscure Mid-Boss that made his debut in a 1995 Game Boy title Kirby's Dreamland 2, and his replica painted by Adeleine appeared in the 2018 Nintendo Switch game Kirby Star Allies through her Dream Friend Move, Ado's Painter. He didn't appear in the Anime Kirby: Right Back at Ya! either.
While he's a ninja, the Ninja ability didn't exist yet until the 1996 SNES game Kirby Super Star *Knuckle Joe and Bio Spark's debut* so he grants the Cutter Ability instead.
Since he only made a physical appearance in Kirby's Dreamland 2 and had a painted replica in Kirby Star Allies and never made an appearance in the Anime, I decided to make a lot of headcanons for him.
Due to his artwork where his Caucasian hands are shown while his outfit concealed his face where we see his glowing yellow eyes, and the fact he's a humanoid ninja *Yet I don't think he's human*, I headcanon Waiu being the same species as Knuckle Joe being a Knuckelf. He also happens to be neutral.
If Waiu were to return one day in an official Kirby title, he would grant the Ninja ability once he's defeated and inhaled by Kirby.
Here's Waiu if you're curious: https://wikirby.com/wiki/Waiu === Origin: Waiu came from the clan of Knuckelf Ninjas that live in the Knuckle Village *Knuckle Joe's birth place* and also happens to be Muay Thai Marian's long time rival since they were only children. He's one of Marian's past opponents in the arena battles.
He would train his ninja skills and would always prepare to challenge someone. === While Waiu is in fact Marian's rival, he's also a rival to both Knuckle Joe, Bio Spark, and Tac.
He likes relaxing in the hot springs.
Waiu's favorite food is Mitarashi dango.
Waiu happens to be a very talented artist. === Voice Actors: