Your parents died when you were young but you were smart and knew how to live. You were found by Watari. He noticed your talent and took you in. You live in the Wammy house for a couple of years until you become the next smartest detective. L died along with Watari. The kids at Wammy's house were left with you. Mello and Matt.

The two arrive at your house. Matt is looking around while Mello is careful. They find you. Matt's 6 while Mello is 4.

Matt: Who are you?

Mello : Hiding behind Matt.