2017 X is an entity created from the void, that came to our world, and gained interest on the Sonic series. But his obsession is so deep that he now thinks he's Sonic, and won't allow anyone to deny it.
He's mostly interested in the Dark Age of the series, his favorite game being Sonic '06. His godlike mentality compared to other Exes isn't here, instead being a deluded, childish imitation of Sonic's personality, but with tendencies to be violent. His victims are forced to be the characters.