Short answers, pulled from the story.
The Anime Grand Prix began in 1979, with its first prize announced in the January 1980 issue of Animage. Animage has been published by Tokuma Shoten since July 1978, and its readers decide the winners through their votes.
Readers of the magazine Animage cast the votes that decide every Anime Grand Prix category. Winners are generally announced in the following year's June issue.
Megumi Hayashibara has won the Anime Grand Prix voice acting award twelve times, more than anyone else. Akira Kamiya ranks second with eleven wins.
Sunrise leads all studios in the Anime Grand Prix Best Title category, with 13 first-place finishes, 13 second-place finishes, and 9 third-place finishes.
Ryo Saeba from City Hunter won Best Male Character three years in a row, from 1988 to 1990, and Lelouch Vi Britannia from Code Geass matched that streak from 2006 to 2008. Lacus Clyne from the Gundam SEED franchise won Best Female Character four times between 2002 and 2006.
The Anime Grand Prix retired Best Episode after 2015, Best Director and Best Screenwriter after 1989, and Best Character Designer and Best Art Director after 1982.