Sylar has appeared frequently throughout all of the seasons. His prescence wasn't know as much in season two, but picked uped considerably throughout 'Villains' and 'Fugitives'.
No. She lied to him. His real mother died. His father killed her, and Now Sylar's father is dying of cancer.
The burning body isn't Sylar, Its the body of another shapeshifter - who has shapeshifted into Sylar. He was killed, allowing them to burn the body, under the illusion it was in fact Sylar.
Sylar probably appears the most in season three, but he makes frequent appearances in all the other seasons as well. He appeared the least in season one as his character was still being slowly introduced.
Sylar is a chachter on the NBC tv show HEROES
Yes they do, when Sylar steals Clair's ability for instance.
Zachary Quinto
Sylar's favourite type of pie is peach pie which he absolutely loves.
Mylar
The First time it is episode 9 - season 1 in 'Homecoming' But he attacks and gains her powers in 'The Second Coming' which is episode 1 season 3
The real Nathan is dead, There is no way he could have survived given the wound he sustained from Sylar. ( Neck slitting ) However Matt Parkman, was begged by Angela to persuade Sylar that HE was Nathan, so now Gabriel Gray believes he is in fact Nathan Petrelli- but with a force as strong as Sylar's I doubt It will last.
Kristen Bell played El in Heroes but Sylar later killed her.
The Chain by Fleetwood Mac