By now, everyone knows about Pun-Pun, the kobold who uses the Manipulate Form ability to attain godhood at low level. However, when looking at the fluff for Forgotten Realms, I found a point that may make the Pun-Pun build impossible. If I'm reading things right, kobolds may be immune to Manipulate Form.
The Manipulate Form ability gives god-like power to change the abilities of "any Scaled One native to Toril." Obviously, kobolds have scales. However, I'm not sure kobolds are actually native to Toril. I know dragons originally come from another plane. Since the fluff (and the Dragonwrought feat) suggests kobolds are somehow related to dragons, I would assume that kobolds are not native either. Thus, I think Pun-Pun doesn't work.
Of course, that doesn't stop the 0 LA yuan-ti race from doing the exact same thing.