Since NPC's aren't shaped like that, then I'm assuming you're using NPCs from a mod or mods, right? It's probably just a bug in the coding for that.
Log out, then log back in. It should fix it. If not, than reinstall the mod.
Or, that could be a player in a skin. If so, can't help ya' there.
Yeah I am using a mob mod. Elemental Creepers. Should I uninstall it?
That shouldn't cause NPCs to appear, at least not ones like that. Is this on a server, and/or are you using a texture pack? Those might effect the textures.
click on this link and help me please!
http://tinypic.com/view.php?pic=mv6gqs&s=6
Log out, then log back in. It should fix it. If not, than reinstall the mod.
Or, that could be a player in a skin. If so, can't help ya' there.
Edit: Ninja'd by JSSarfin
That shouldn't cause NPCs to appear, at least not ones like that. Is this on a server, and/or are you using a texture pack? Those might effect the textures.
Maybe it has something to do with Doku. Have you tried switching to the Vanilla textures and seeing if it was still like that?