One of the original Street Fighters. Every game of the Street Fighter series has him in it. Arguably, one of the best characters in the whole game.

A vastly enthusiastic and annoying person.

Usually of Japanese decent

Ryu a lone wanderer solely looking for spiritual enlightenment.

He trained with ken and akuma of whom each there sensei was Gouken Akuma's brother.

Goutetsuo the shotokan master was killed by Akuma on releasing the dark hadou(shun-goku-satsu). Thus giving Ryu a new goal to find and fight Akuma.

They have thus far fought three times, Ryu won the first Akuma won the second... I do not know who won the third as my game does not work. It is not mentioned in either SF2, SF2V or the SFA movie.

Retarded Jackass

There is no true definition for this word. It can be used in any context. When it's implemented, the recipient will become confused.

A demonic sibling that you'd die for but would never admit to it-

A person who forcefully implies their own opinions to his or her friend group. These are sometimes people who disregard others who tell them the truth and keep grudges until their death.