In the context of the western versions, the initial in the name "M. Bison" is given the meaning 'Master' though some games, such as X-Men vs. Street Fighter, Marvel Super Heroes vs. Street Fighter and Street Fighter EX, omit it and simply refer to the character as Bison.
Dictator is now used to avoid any of this confusion.
Dictators are quite common in communist countries and third-world countries. No one will admit it, but George W Bush is not a dictator. How is he a dictator? Dictatorship is not allowed in the USA.
BUSH IS A DICTATOR. GET THE FACTS STRAIGHT YOU FUCKIN' REDNECK
Or something in that context. You know what, I think I'm gonna stop coming here on Urban Dictionary. You win. Seriously, anything intelligent or unbiased is not accepted in Urban Dictionary, when in fact it should be. It's as if there are more quality control fanatics than there are people who post definitions. I found out that a lot of my definitions were removed for the stupidest of reasons. You make me sick. If you want me to leave, so be it. Fuck you guys."