As such, it is considered to be incomplete regarding the information available.
JAPANESE ONLY The article below is based on non-localized content only available in Japanese. As such, all information in this article is based on fan-contributed translations.
The Danganronpa franchise has been involved in many collaborations with other franchises since the release of Danganronpa: Trigger Happy Havoc in 2010. The franchise has also been referenced and parodied in other media throughout the franchise's history.
Owada brothers appeared as a playable character. 
Mobile Game Events
Danganronpa 3 x Hōkai Gakuen: A Danganronpa 3: The End of Hope's Peak High School collaboration event was held in the Chinese and Japanese releases of the iOS/Android game Hōkai Gakuen (崩坏学园 Collapse School, known as Guns Girl - School DayZ in English). The game featured 8 members of the Danganronpa 3 cast, including their Japanese voice actors and many unlockable Danganronpa 3 themed items.
Danganronpa 3 x Fish Island 2: A collaboration with fishing game Fish Island 2 began in April 2017. The game featured fishable versions of Monokuma and Monomi, unlockable Hope's Peak Academy uniforms, and several Danganronpa 3 characters as collectible spirits.
As a promotion for the Blu-Ray and DVD release of Danganronpa: The Animation, promotional posters and a TV commercial crossing over Danganronpa and the 2012 American movie Ted were released in Japan. The promotion featured Monokuma and the titular character Ted, who is also a bear.
In the anime, Wooser was shown acting as Monokuma and Monokuma did also make a cameo appearance. Later, after the episode ended, Wooser and his friends were shown in a Class Trial, making Monokuma execute Wooser.
The DanganGravity Live Broadcast (ダンガンGRAVITY生放送) was a joint livestream held by Playstation Japan, streamed live online through Youtube Live, Fresh! and Nico Nico on December 25, 2016. The event involved a cross-collaborational playthrough of the demos of both Danganronpa V3: Killing Harmony and Gravity Rush 2, with each development team playing the others' game. The event also featured a special mix of Danganronpa songs created by Masafumi Takada.