Ryan's World YouTube star who reviews various toys on his popular channel Ryan's World, which has earned over 39 million subscribers. He and his family signed a multi-platform deal with Pocket.watch in 2017 and starred in their own show on Nickelodeon called Ryan's Mystery Playdate in 2019. 

The first video was uploaded to his channel in March of 2015, but didn't start steadily gaining subscribers until August. His YouTube channel was previously called RyanToysReview. 

His most popular video, in which he receives a giant Lightning McQueen egg, has received over 400 million views. In 2018, his toy channel entered the Guinness Book of World Records. He began posting Roblox gameplay to his YouTube channel in 2020.  He starred in his own movie, *Ryan's World the Movie: Titan Universe Adventure*, which was released in over 2,000 theaters in August 2024.

Ryan Kaji's parents Shion and Loann met as undergraduate students at Texas Tech University. Shion moved to the United States from Japan in high school and is the son of a microchip executive. Loann's family fled from Vietnam as refugees, and she grew up in Houston hoping to become a teacher, which she later did. Shion left Texas to get a master's in engineering at Cornell University, but returned soon after Ryan's birth, completing the degree online.

Ryan Kaji began making YouTube videos in March 2015 after watching other toy review channels.Kaji's mother decided to quit her job as a high school chemistry teacher to work on the YouTube channel full-time.