Although Charlie was first introduced as a playable character in Street Fighter Alpha he has been part of the series backstory since Street Fighter 2 where he was introduced as Guile's deceased war buddy. Guile's reason for entering the second world warrior tournament was to avenge Charles death at the hands of M.Bison. Charlie doesn't like Shadaloo.
Charlie's fighting style in the Alpha series is very similar to Guile's, he uses many of the same attacks including the Sonic Boom and the Flash Kick, although he has a slightly different technique (for example he only uses one hand when throwing a sonic boom). The backstory states that it was Charlie who taught Guile his techniques which explains the characters similarity.
Street Fighter Alpha
After defeating Bison, Charlie calls to his base to take the drug lord into custody. Charlie has trouble getting through when Bison springs up and kills him. Bison leaves knowing he can full well control the army.
Street Fighter Alpha 2
Charlie defeats Bison and interrogates him over his connections with the top brass. Suddenly, Charlie's backup helicopter turns on him and riddles him with bullets. He falls losing his dog tags. When Shadaloo troopers wish to confirm the death, Bison assures that Charlie did not survive the fall.
Appearing in various Capcom/Street Fighter vs. games, Shadow appears as a blacked-out version of Charlie, not unlike Mortal Kombat's Noob Saibot. Shadow has psycho-power inspired special moves in addition to Charlie's moveset. His super combo is the Final Mission.
- In one of Guile's original Street Fighter 2 win poses he holds up Charlie's dog tags.
- Charlie is unique in that in almost every Alpha game he dies during his own ending sequence, despite this he has always been brought back for the sequels.