Hiro Nakamura, character on TV's "Heroes"
Hiro, character in manga "Soul Eater"
Hiro Protagonist, main character in Neal Stephenson's SnowCrash Hiro Hamada / Hiro Takachiho, character in comic/film "Big Hero 6"
Hiro Hiyorimi, main character in manga "Princess Resurrection"
HiroGranger, a character in the Beyblade series
Hiro Sohma, a character in the Fruits Basket anime and manga series
Hiroshi Nohara, character in the Crayon Shin-Chan series
Hiro, character from the Hidamari Sketch comic strip
Hiro, main character in Lunar: EternalBlue video game
Hiro, character in Ginga Densetsu Weed series
Hiro Sakurai, character in manga Miki Falls
Hiro, a Japanese steam engine character from the Thomas and Friends special "Hero of the Rails"
Hiro Fuse, character in Scott Westerfeld's Uglies series
Hiro the Mini Ninja, player character in Mini Ninjas video game