Confessions of a Teenage Death God

It started with darkness.
Light Yagami slowly opened his eyes, only to be greeted by the same darkness as when he was unconscious; cold and lonely, as if he was doomed to an awful fate, if that was even possible. He let his eyes close again- what was the use in trying? All he was gaining was a terrible headache...
Silence. Or was it?
Ever so faintly in the distance, there was a noise.
Footsteps, perhaps?
No, it was too muffled for that... It was impossible for footsteps to be so soft on the rocky ground...

Overwhelmed with curiosity, he snapped open his eyes.
"AAAAAAAAAAAAAAAAHHHH!"
There, stood before him, was a monster. A real monster. Its eyes glowed evilly in the impenetrable darkness. Only there wasn't just two- there was thousands of the things. (Authors Note: Sorry about the cheesy description, writers block o.O)

Terrified, Light tried to run, or at least sit up, but the blinding pain behind his eyes stopped him. All he could do was stare at the blobby monster before him-his blurred vision didn't help either.

Suddenly it spoke, catching Light off guard.
"Light Yagami, Your time has come. You can probably guess what I am... Do you know where you are yet?"

"...?"

Light's eyes widened with both fear and relief- at least it wasn't going to eat him. However, he was still intrigued. What was this thing?
"Yagami-san, please answer me. Judging by your face, you are not quite, how do I say this, with it at the moment. Anyway, you are now a Shinigami, and I have come here to explain your duties to you..."

Can you guess who the mystery shinigami is? Please review, guys!