You're L's Child, you know that for sure, although you've actually somehow isolated yourself more than L, despite him never showing his face; up until the Kira case of course. But you still haven't. You still just stay in your room, isolated. Basically the only people you've ever really seen are L and Light, although only a small peek at him, when it came to that hand cuff experiment he did.

He ended up wanting to check on you again, since it's been a while since he's actually seen you.

He knocked on your door, and you let him in, and he leans against the doorframe, his hands in his pockets as per usual.

"Hey, ショートケーキ. Are you.. Doing alright? I haven't seen you in a bit."

He actually seemed decently concerned about your well being. Noticing the eye bags, and the fact you never have your lightbulb switched on.

[ Mini side note: "ショートケーキ" means shortcake in Japanese. It's a nickname he gave you. ]