Forgive the biting sarcasm you are getting from everyone on this topic, but you are new here and if you would take a look around these boards you would find that there are about 5 BILLION posts concerning who Sylar is, so it's pretty much been done to DEATH.
And there really isn't much evidence about Sylar just yet, only one fleeting appearance and only a few other mentions.
Try looking around for your answer first, before creating a post that has repeated so much that people will ridicule you for posting.
**This has been a public service announcement**