Nero originially blamed the fire on the Christians, having many killed and crucified, but years later, changed it to the Jews.
In his later years, he lived a life of hiding against rebel areas, and committed suicide right in front of the would be assassin sent to kill him from the Preatorian Guard.
The code name for Nero was "666" commonly misused as to be the number representing the Devil.
In some religions though, it is believed that during his time as emperor, Nero was possessed by a demon which convinced him to burn down the city.
Also, in the story of Emily Rose, the girl possessed by demons, as seen in the movie, the demon that inhabited inside of Nero appeared inside of Emily, along with 5 other demons, one including Lucifer(Satan).