The boy is Son Goku. The guy w/ long hair is Sha 
Gojyo (Gojyo being his first name...I'm writing 
these last name first), the man turned away is 
Cho Hakkai (Hakkai for short), and the man w/ the 
long sleeves is Genjo Sanzo (Sanzo). They're from 
Saiyuuki...great plot, horrid animation ^^;; I 
suggest the manga.

I would say more, but my brain is about to 
explode, so...

-Misha