Biospark and Waiyu (and just maybe Boomer from the first Dreamland game) can easily be seen as Ninja by anyone who has even heard of a “Ninja”. However, you must be aware that Ninja are the most commonly exaggerated piece of Japanese History/Mythology.
Waiyu was the hardest Mini-boss in Kirby’s Dreamland 2. He constantly appeared and disappeared over and over. He threw small blades at Kirby on occasion, but Kirby could use the blades to his advantage if he manages to avoid them. Biospark was one of the more popular brand of “Helpers” (AI controlled Second Players) from Kirby Super Star. As a enemy, Biospark held their stance and on threw scores of three Kunai Knives at Kirby. Kirby inhaled Biospark for the Ninja Ability. Ninja Kirby and Biospark have more advanced and defined abilities than most of the other helpers. Their main weapons are Kunai Knives which they used for throwing long distance and “Quado-Shock”. They could also stick to walls and perform a triangle jump to climb upwards.
All of them are said to be Ninja. Of course, that, in itself, may be wrong. Ninja are one of the most elusive figures in East Asian History. It has gotten to the point where almost any information on Ninja are often unfounded and unreliable. In fact, the most we have ever seen of any Ninja is in both Japanese and Western Fiction, where they are shown either or both, realistic and exaggerated. In fact, most ‘information’ on Ninja is so fiction-like, I’m having trouble writing this. Through all this, their definition is the same, they are skill assassins that trained themselves with the art of “remaining unseen”.
(Please be warned, even the best of sources I could find were highly unreliable.) The word Ninja is transliterated English word for a combination of Japanese Kanji that were used to describe them. They are alternatively called “Shinobi”. Shinobi are rumoured to have been traced as far back as the Asuka Period in Japanese history. Shinobi are not generally connected to just Japan, as similar figures have been reported to have existed in Korean and Chinese History as well.
Whoever Ninja were, they didn’t really like to brag about what they were doing, or even talk about it. They almost never left any psychical evidence behind, and when they want to remain unseen, they can hide themselves almost perfectly. They had to have been good at this, since no one even knows what a Ninja looks like. The idea about a “Ninja Suit” dressed in all black is a misconception; they were mostly in disguise all the time as peasants, samurai or priests. The idea of the Ninja suit came from certain theatres, where prop handlers dressed in black as they moved the stage setting around.
Ninja were hired by feudal lords and several shoguns to do secret missions and assassinations. People who became Ninja were probably of real low social class or status – at least low enough so they could not become Samurai. They used common, everyday tools as weapons for their killings. They often spread exaggerated rumours about their own abilities to make their targets nervous. Female Ninja were called Kunoichi, they were spies and they used the art of seduction to worm their way into the enemy’s lives and tried to expose their secrets.
There have been many questions asking if Ninja even existed all. There is more evidence deny them than supporting them. This means, if they did exist, they did their jobs rather well, didn’t they?