Since his first time on the stage at age 10, Toyonaga has been active both on television and stage.
On May 2018, he announced that his wife gave birth to a daughter last year.
His hobbies are playing guitar, and reading.
He debuted on a major label with the single "Reason" on December 16, 2014 as the theme song to the game Durarara!! Relay.
He debuted on 2002, voicing Takahiro in the 2002 OVA, Yokohama Kaidashi Kiko Quiet Country Cafe.
He was the winner of the Best Actor category on the 12th Seiyuu Awards.
On October 2015, he announced that he is married to a woman outside the entertainment industry.
He is left-handed.
Along with his acting career, Toyonaga has also released a series of indie singles and released his first album, Music of the Entertainment, on April 28, 2014.