As stated on Hudson Soft's website, in their "The Definitive Bonk" article, Bonk was originally created as a comic character, PC Caveman (Genjin), in a magazine for the PC Engine. So many people liked the character that there were talks held on giving him a game of his own. In addition to this, many people even mistook him for an upcoming game character even before his game was in development, because the magazine frequently featured comics of upcoming games. Some reputable sources confirm that this character was based on an individual named Tasos; specifically due his large head.

Bonk's Adventure (PC Genjin) was the first game starring Bonk and was released for the TurboGrafx-16 in 1990. A variation of the TG-16 original eventually appeared on the NES with fewer colors and reduced graphic quality. Another variation was released for the Amiga under the name BC Kid. A completely new game, with 2 player co-op, was released for the arcades, while another new game utilizing the same name was released for the Game Boy. A remake of the original was released in Japan many years later on the PlayStation 2 and the Nintendo GameCube.

Bonk's Revenge (PC Genjin 2) was released for the TurboGrafx-16 in 1991, while a completely different game using the same name made it to the Game Boy.

Bonk 3: Bonk's Big Adventure (PC Genjin 3) was released for the TurboGrafx-16 as 2 versions in 1993: a TurboChip (cartridge) version and a Super CD-ROM version, the latter of which featured an updated redbook audio soundtrack.

Super Bonk (Chō Genjin, Super B.C. Kid), was the 4th game in the series and was released for the Super NES in 1994. It was the first console entry in the Bonk series not to see a release on the TurboGrafx-16 platform. Super Bonk was later re-released for Nintendo's Virtual Console in Japan on November 16, 2010, the PAL region on December 10, 2010 and in North America on April 4, 2011.

Chō Genjin 2 was the 5th and final console game in the series. It was the follow-up to Super Bonk, and was released in 1995 only in Japan on the Super Famicom (Super NES). Chō Genjin 2 is commonly referred to as "Super Bonk 2" in English-speaking countries.

GB Genjin Land: Viva! Chikkun Kingdom was a collection of mini games starring Bonk, released for the Game Boy.

Genjin Collection, a collection of the 3 Game Boy titles, was released for the Game Boy.

RPG Genjin was planned for the PC Engine, but was never released.

Bonk's Return, a Bonk game released for Mobile phones, plays a lot like the first two Bonk games but offers very little diversity in the level design.

The TurboGrafx-16 version of Bonk's Adventure was released for the Virtual Console service at its launch on November 21, 2006. Bonk's Revenge was released on April 16, 2007 and Bonk 3: Bonk's Big Adventure was released on September 3, 2007 in the United States.

A new Bonk game, Bonk: Brink of Extinction, had been announced for the PlayStation Network, Xbox Live Arcade, and WiiWare. The title was expected to arrive sometime in 2011 and would have included cooperative play but it was canceled.

His first game, Bonk's Adventure, was released in 1990/1989, published by Hudson Soft in Japan and by NEC Electronics in the United States, and developed by Atlus Software and Red Company. The game was a side-scrolling platformer, a genre that was very popular at the time, especially for mascots (Sonic The Hedgehog and Mario both vaulted to mascot status via this genre). Bonk's Adventure was very well received by critics outside of Japan, winning several awards in 1990: "Turbografx-16 Game of the Year" by Game Player’s Magazine, "Most Exciting New Theme of 1990" by Electronic Gaming Monthly Magazine, "Special Achievement Award" from OMNI Magazine, and "Best Action Video Game of 1990" by Video Games & Computer Entertainment Magazine. Despite this, the TurboGrafx suffered from poor sales, and the Bonk mascot was eventually retired in 1992 (with the launch of TTi's new TurboDuo console), replaced by Air Zonk (the official mascot of the Duo). Zonk—a "future descendant of Bonk", according to the mythos—bears a strong likeness to his predecessor, Bonk. Zonk, who was featured prominently in all of TTi's branding efforts, was the only mascot for the TurboDuo.

When NEC's TurboDuo console was sold in 1992, it included a CD-ROM containing Bonk's Adventure, Bonk's Revenge and Gate of Thunder, packaged with merely a slipcover and manuals.

Kaneko published an arcade version of Bonk's Adventure (released as B.C. Kid in Europe) in 1994. This version offered more enemies per screen than the standard Bonk game and included a variety of other strange tasks for the player to accomplish. Other unique features included two-player simultaneous play and the only female Bonk in the series.

Bonk also appears in the Sega Saturn game "Saturn Bomberman" as a playable character in multiplayer mode. This was his only appearance on a SEGA console.

Hudson Soft, who published the Bonk games, was absorbed into Konami in 2012. As a result, Konami now owns the rights to the Bonk series.

In the original game, the second power-up stage turns Bonk into a caveman, but in the Japanese versions of the second and third games, he becomes a cavewoman.[1] The caveman transformation was re-used for the western entries in the series, as the gender transformation may have been considered inappropriate for the target demographic outside Japan.

In the Japanese version of the second game, the ending sequence opens with karaoke-style theme song subtitles. This song was completely absent from foreign releases. Also, the drawing of Bonk during the credits is completely different between both versions.