Thanks in part to its deceptively intricate (and not always explicitly spelled out) lore, the Kirby series has many headcanons to its name.
- One Japanese guidebook for Kirby's Dream Land 2 claimed Dark Matter was a Tortured Monster that attacked Popstar because it was jealous of all the "happiness" there. Just about every fan accepts this as official canon, but they always flanderize it into applying to Zero/02 alone, despite Zero not being introduced until the sequel (the Tears of Blood likely have something to do with it).
- Most Japanese fans depict Dark Matter Blade as having floating hands like Magolor (except with fingers).
- People really seem to like the idea that Meta Knight is like a father figure to Kirby, to the point where the Japanese have their own term for the whole headcanonnote . This stems from his portrayal in the anime, where he's more protective and supportive towards Kirby (though still largely enigmatic).
- Fan art that depicts both Kirby and Gooey together often show Gooey as being very close friends with Kirby, to the point where they're best friends. The Dream Land 3 instruction booklet does support this, describing the two as "good friends."
- Many fans believe that Meta Knight's mask contains a voice changer/amplifier like Darth Vader, to provide his trademark baritone, and that his "real" voice would sound more like Kirby's (or at least not nearly as deep).
- Did Bandana Waddle Dee appear in Kirby 64, minus the blue bandana and spear? Some fans think so. With Adeleine's trailer for Star Allies showing him alongside the rest of the 64 cast (as opposed to Parasol Waddle Dee, who's also a partner in that game), this may even be confirmed.
- Many fans agree that Susie, Haltmann, the Three Mage-Sisters, and Hyness are all from Halcandra like Magolor is. Though some of Magolor's new dialogue in Return to Dream Land Deluxe calls this into question, as Magolor admits that he's not actually from there.
- On the subject of Magolor, many fans have decided that he resembles a cat underneath his hood, mostly because of his triangular ears. This would eventually be referenced by HAL, as Magolor is featured in a piece of artwork
made for National Cat Day, alongside other cats from the Kirby series. - There's a Japanese fan comic on Tumblr (translated here), detailing Gooey's exile from the Dark Matter and the start of his friendship with Kirby, that is accepted by just about everyone who reads it as Gooey's "official" backstory.
- "Gamble" being the name of the galaxy that contains Popstar and its neighboring planets. This is derived from Gamble Galaxy, the final world of Kirby: Squeak Squad.
- Before notes from a Japanese art book confirmed Ado and Adeleine to (probably) be the same person, fans had a habit of drawing them as identical twin sisters. Western fandom used to consider the pair Half-Identical Twins before Ado's gender was confirmed, and some still do, as a way to further distinguish them.
- A semi-common piece of fanon is that Marx is a Noddy, due to his appearance resembling one and the fact that his jester's cap looks a lot like the nightcap that Noddies wear.
- It's common to see "Nova" used in place of "God" in Kirby fan works (i.e. characters saying "Thank Nova!" rather than "Thank God"), as a reference to the wish-granting comet Galactic Nova. Since the release of Star Allies, "Void" is also used in a similar manner, given Void Termina's status as an actual god entity worshiped by a cult.
- Since Dark Meta Knight is the final enemy of Triple Deluxe's Dededetour from within the Dimension Mirror, it's widely believed that he was also the one to corrupt Queen Sectonia via the mirror, whether intentionally or not.
- When the Lor Starcutter is made into a character (building off its implied sentience), it's generally considered to be female.
- Kirby's Dream Land 3 introduces "enemies" known as Batamon that look just like Kirby, but have no offensive abilities, and are basically as weak as Waddle Dees. Fan theories suggested that since characters in the setting have demonstrated the ability to become more powerful with effort, such as Kirby learning to copy abilities and Dedede mimicking Kirby's style of flight in the second game, that Kirby is just a Batamon that "leveled up." This one becomes less prominent with each new game that doesn't have Batamon in it, however.
- It's heavily implied by the Holo-Doomers 2.0 Flavor Text that Susie ended up in Another Dimension after the accident that caused her to go missing. Since Magolor is a (former) resident of Another Dimension, fans are fond of the idea that the two met at some point during the time she was there. Often this is embellished into the two having to band together to survive on Halcandra for a time and shippers are prone to using it to set up a Childhood Friend Romance between the two.
- A large number of fans believe that Morpho Knight may actually be female, due to the dimorphism of morpho butterflies — only male morphos display the blue wings; females are usually more orange in color — much like Morpho Knight themselves. Others additionally point to how the first part of Morpho Knight's Japanese name, バルフレイナイト (Barufurei Naito), may be a portmanteau of "valkyrie" (バルキリー, barukirī) — who are traditionally female (and Always Female in the source material) — and "butterfly" (バタフライ, batafurai).
