Franchise: Kirby

The North American boxarts for Kirby games are edited to make Kirby look angry. It's thought this may be an attempt by Nintendo of America to make Kirby look cooler, and to lessen the notion that they cater to kids.

When Donkey Kong became popular, Nintendo was sued by American film company Universal Studios over allegations that Donkey Kong was plagiarizing their 1933 film King Kong. Lawyer John Kirby, defending Nintendo, pointed out that Universal was aware of and had previously argued in court that the story of King Kong was in the public domain due to the film's novelization, which came out before the film and marked the first non-promotional appearance of the character, failing to have its copyright notice renewed. As a result, Universal lost the case. Nintendo lavishly awarded Kirby by taking him, his wife and some associates to dinner at a fancy Manhattan restaurant, giving him a sailboat named "Donkey Kong" and the exclusive rights to the name Donkey Kong for sailboats as a strange show of gratitude.

In a 2011 interview with Game Informer, Shigeru Miyamoto stated that "Kirby" was one of many candidates on a list of names that were proposed for the then-in development video game character, and upon seeing it, he recalled John Kirby and felt that a connection between the two would be amusing. However, the name was picked not as a tribute to the lawyer, but rather because the harsh-sounding nature of the name was a comedic contrast to the character's soft, cute design.

A prequel to the Kirby series titled "Kid Kirby" was being developed for the SNES by DMA Design, now Rockstar North. The game was a platformer featuring a younger Kirby which would've utilized the SNES Mouse peripheral, however the game was canceled supposedly due to the mouse not selling well.

In a released concept art in Kirby's Dream Collection, an unknown knight was shown with red butterfly-like wings. Since this artwork was in Meta Knight’s section, many presumed it to be Meta Knight's beta design. However, in a Nintendo Dream magazine interview with Shinya Kumazaki, he confirmed that the design was originally for an entirely different knight that would have appeared in the cancelled Kirby GameCube game. This design would later be used for Morpho Knight in Kirby Star Allies, ​​​​except with a different sword.

Lololo and Lalala, two recurring bosses throughout the series starting with Kirby's Dream Land, are actually Lolo and Lala from Eggerland/Adventures of Lolo. Both Kirby and Eggerland were developed by HAL Laboratory.

While most abilities got hats in Kirby Super Star, the Hammer ability didn't get one. The current hat seen today first appeared in the Kirby anime, with some minor tweaks.

For the Kirby: Right Back at Ya 3D Short on the 3DS, the original cast members were all brought back to reprise their roles. The only exceptions were Maddie Blaustein, who didn't return to voice Chef Kawasaki as she passed away in 2008. And Andrew Rannels, who didn't return as Nightmare due to him taking a busy career on Broadway.

Whip Kirby is a possible reference to Indiana Jones, as Jones has an extensible coiled whip that can be used to grab objects. Kirby also has Jones' hat, only with a star motif.

When Meta Knight is defeated in Kirby's Adventure, his mask breaks revealing his face to be identical to Kirby's, hinting that Kirby and Meta Knight are the same species.

The recurring enemy Cappy resembles a modern interpretation of a Haniwa doll if his mushroom "cap" is removed.

In the Japanese version of several Kirby games released since 2011, during the tutorial, a red circle will appear whenever an action is properly done. However in the international version, the red circle was replaced with a green check mark, possibly to not confuse the player whenever they performed a correct action. In Japan, a circle is used in the same manner as a tick is in the west.

A program titled "Kirby Family" (a spiritual successor of Mario Family) was planned to be released for the Game Boy Color. The game was showcased at Spaceworld 2001, but the plans to retail it outside of the event for 6,800 yen on September 10, 2001 were scrapped.

The enemy Pacto bares a resemblance to Namco's mascot, Pac-Man, as both have the same yellow skin color and they both open and close their mouths in similar fashions.

Sword Kirby bears a strong resemblance to Link from The Legend of Zelda series, and like Link, can shoot sword beams at full health. Despite minor differences in the hat and sword designs, this is clearly an intentional reference, both Kirby and Link being well known Nintendo characters.

Although Meta Knight first appeared in Kirby's Adventure, he wasn't given a name until the release of Kirby's Avalanche.

Archie Comics attempted to obtain a licence from Nintendo to make Kirby comics, but failed to do so.

After the anime series Kirby: Right Back at Ya! came to the West, the logos for almost every Kirby game since then have been stylized the same way, starting with Kirby: Nightmare in Dream Land.

The way Wheel Kirby uses his Rocket Start move in Kirby Triple Deluxe and Kirby: Planet Robobot bares a striking similarity to the Spin Dash move used by the titular character of the Sonic the Hedgehog franchise.

In an interview with Satoru Iwata and Masahiro Sakurai for the Japanese exclusive game guide for Kirby's Adventure, Sakurai stated that they wanted a character that a person could draw in a sketchbook easily, which resulted in the main character Kirby.

According to Masahiro Sakurai on his YouTube channel, he thought a lot about how to implement the unique gameplay element of Kirby using each of his enemies as an attack, which originated from Sakurai's need for a "Risk-Reward" system for his game. He even revealed that an early concept of this was Kirby using a long tongue, instead of his signature vacuum, to catch and consume enemies, and he further stated that this concept predated Yoshi's tongue attack too.