Monica Jean Rial was born on October 5, 1975 in Houston, Texas. Her father is from Pontevedra, Galicia, Spain. When she was young, her family would often visit Spain. She would translate for her younger brother some of the European Spanish-dubbed cartoons which included anime shows Doraemon and Dragon Ball Z, often imitating the various characters. Rial studied ballet, tap, and jazz, but transitioned to musical theatre when was 12. She studied acting through high school as well as college at the University of Houston. In an interview with Otaku News, Rial mentioned voice actor inspirations from The Simpsons, Family Guy and Beavis and Butt-head. She was working on a theatre show with Jason Douglas, who suggested she audition for ADV Films. Her first voice-over role was some walla in the 1999 dub of Martian Successor Nadesico. In an interview with Otaku News, Rial said she had to talk for two minutes straight as folks in a crowd telling the Jovians to go home. She would later land main character roles as Miharu in Gasaraki, Natsume in Generator Gawl, and the title character in ADV Films' production of Hello Kitty's Animation Theater, the last of which was one of ADV's best-selling DVDs. In 2001, she voiced Izumi in the baseball anime Princess Nine and in 2002, she got to voice Hyatt in Excel Saga, which she listed among her absolute favorites.