Story.
Sean is a half-Brazillian, half-Japanese young fighter and student of Ken (although this took quite a bit of searching and convincing). He enters the 3rd Street Fighter tournament to prove himself, but got defeated by his own master, Ken. He tells Sean that he must find and defeat Ryu, saying that he must defeat him to be any good, so Sean does find (a rather confused) Ryu- but keeps getting defeated by him anyway. (Street Fighter 3: Double Impact.)
Sean dreams of winning the US Martial Arts tournament, but realises it is just a dream from him being knocked unconscious. Ken wins the tournament and offers Sean the trophy, but he declines it- saying that he wants to win it for himself (Street Fighter 3: 3rd Strike.)
 

Moves.
Sean Tackle- HCF+Any Punch Button (hold Punch to tackle).
Dragon Smash- DPM+Any Punch Button.
Tornado- QCB+Any Kick Button.
Ryuubi Kyaku- QCF+Any Kick Button.
Zenten- QCB+Any Punch Button.
Straight- Down,Down+Any Punch or Any Kick Button.
Sean Pachiki- Forward+Heavy Punch.

Super Arts.
1. Hadou Burst- QCF,QCF+Any Punch Button.
2. Shoryu Cannon- QCF,QCF+Any Punch Button pressed rapidly (in Second Impact).
3. Hyper Tornado- QCF,QCF+Any Punch Button.