Harold "Happy" Hogan, (male) chaffeur/personal assistant and friend of Tony Stark in the Marvel Universe
Happy (full name Harriet), character in the movie "Gigantic" played by Zooey Deschanel Biff and Happy Loman, sons of unsuccessful salesman WillyLoman in the ArthurMiller play "Death of a Salesman" (1949)
Happy, a character in the manga/anime series Fairy Tail
Happy Days-TV show
Happy-character in "Snow White & the Seven Dwarves"
Happy Endings-TV show
Happy, name of the dog on Seventh Heaven
Happy Gilmore, male character from the movie Happy Gilmore
Happy, male Exceed/Cat in "Fairy Tail"
"Happy", song by Pharrell Williams