Elmo from Sesame Street: You either hate him or you love him (or hate loving him because your kids love him, or hate yourself for being an adult who loves him).
Surprisingly, the voice and puppeteer (one and the same) is a deep-voiced black man (http://www.youtube.com/watch?v=IY_sl1R3KJQ)... cool interview; I now officially have great respect (http://www.youtube.com/watch?v=aHDjPJsg9C4&NR) for puppeteers :)
I like the "always on his back" part. :D
It is amazing how they bring the characters to life some times.