I am a huge anime fan, and one of my favorites is Death Note. One day, one of my friend said I was like Light, one of the characters who is smart but crazy, a lot, so they nicknamed me Kira, which if you read/watched it you would understand. I went by that for awhile until someone called me Kyra instead of Kira. The name just stuck after that... A typo became my new username, who'd of thought?