[Justice doesn't understand half of what this child is saying, but he does understand that the boy seems less frightened with his assurance. He crosses his arms, and while he has the unfortunate tendency to always look like he's glaring at whatever he's looking at, the furrow in his brow is one more of thought than of any ill will.]

I used to be in a corpse, but I am no longer. I choose to appear this way because this is how my companions recognize me. And it was not my corpse in the first place, besides.

[Yeah, Dipper, this is going to be a weird one.]

As for what happens after you die, your soul passes through the Fade. You have been there before--that is where you go when you dream. Your soul then goes on to wherever mortals souls go. I do not know where that is or what it is like.