Mido

http://c-uncut.com/media/oot-mido.gif

Mido is the moody Kokiri Child that lives in Kokiri Forest in OoT. He is the guardian to the passage that leads to the Great Deku Tree. He won't let you past unless you have a sword and a shield. When you return as an Adult he says you look like a child he had nearly forgotten. A moody child, but still a pure child.