User blog comment:AYET/Idiosyncrasy/@comment-26195997-20120706110949

Luffy, Ace and Garp actually have a serious sleeping disorder called Narcolepsy. For allot of characters you have suggested with speech problems probably have some form of turrets. Manboshi and Ryuboshi are most likely singing and dancing all the time to seek attention, because there brother is clearly the smarter and stronger one out of the three. Lastly Luffy is just being Luffy, he's a child so he does things that are childish like picking his nose.