Psycho bunnies & kids

[AimoAio]

What I'm looking for:
-Crazy & creepy psychotic bunnies/or any other animals. And when I say crazy & creepy, I mean the horrifyingly scary type. You know, the ones that look cute but terrify children? That kinda thing.
-A seemingly innocent little kid who is anything but innocent. Preferably a boy because the singer is a guy.

What I have so far:
-Kyubei from Mahou Shoujo Madoka Magika
-Will of the Abyss from Pandora Hearts

Note:
-Can be from anime OR manga. I haven't decided which to go for so anything is fine by me.
-I'm not looking for exact scenes but rather vague ideas that might help shape my concept first.
-I don't need the bunny to LOOK crazy. Just standing still and giving off creepy impressions is good enough for me to check it out.

Thank you! ^^

[CodeZTM]

HIgurashi looks like a great source of inspiration for you in terms of innocent but INSANE children.

[EkaCoralian]

The evil little boy from episode 6 of Cowboy Bebop could work.

[Kanti13]

Spoiler :

Selim Bradley aka Pride from Fullmetal Alchemist Brotherhood sound like a good kid for the part. He seems like a sweet innocent kid before you find out he's a Homunculus.

[AimoAio]

I swear I saw an AMV of Higurashi once and it literally gave me nightmares...but then I was a kid so I'll try it now :3 I'll also check out Bebop.

And THANK YOU Kanti! I don't know why I never thought of Selim(considering I LOVE FMA) but he is PERFECT for my idea.

Though I still need some more cause I'm hoping to make this a full video so keep 'em coming guys! ^^