Short answers, pulled from the story.
Chun-Li is a martial artist and Interpol officer in Capcom's Street Fighter series who seeks revenge for the death of her father at the hands of the series antagonist M. Bison. She is considered the first female playable character in a fighting game to gain mainstream recognition.
Chun-Li first appeared in 1991 in Street Fighter II: The World Warrior. She has since appeared in nearly all subsequent installments of the series.
Capcom designer Akira Nishitani decided the character should be a woman and worked out her fighting abilities before settling on China as her homeland. Capcom artist Akira Yasuda, known as Akiman, handled her visual design, drawing initial inspiration from Tong Pooh in the game Strider and from a character named Tao in the 1983 anime film Harmagedon: Genma Wars.
Chun-Li means beautiful spring in Chinese. Chun means the season of spring and li means beautiful in Mandarin dialects.
Chun-Li fights M. Bison to avenge her father's death, which he caused. Across various Street Fighter games and adaptations, she pursues him as an Interpol officer investigating his criminal organization, Shadaloo.
Ming-Na Wen played Chun-Li in the 1994 Street Fighter film, and Kristin Kreuk played her in the 2009 film Street Fighter: The Legend of Chun-Li. Callina Liang is set to play Chun-Li in an upcoming live-action adaptation directed by Kitao Sakurai.