Short answers, pulled from the story.
Sodom is a fictional character from Capcom's Final Fight and Street Fighter series. He is an American Japanophile and member of the Mad Gear gang, first appearing as the boss of the Subway stage in the 1989 beat-em-up Final Fight.
Sodom uses a pair of jitte as his primary weapons in Street Fighter Alpha and Street Fighter Alpha 2. In Street Fighter Alpha 3, players using X-ism mode can have him revert to his katana swords from Final Fight, which in the Japanese version of that game were named Masamune and Muramasa.
Sodom has attempted to write the Japanese kanji shi, meaning "death", on the front of his outfit. He has not written it correctly, so the meaning is lost. This detail reflects his characterization as an American who is fascinated by Japanese culture but fundamentally misunderstands it.
Tatsuya Minami, senior manager of Capcom's Product Planning and Design section, said Sodom was included in Street Fighter Alpha: Warriors' Dreams because he was popular and easy to translate to the one-on-one fighting genre.
In Street Fighter Alpha 3, released in 1998, Sodom crashes his truck into M. Bison's Psycho Drive to foil Bison's plot. The resulting explosion leads Chun-Li and Charlie to presume Sodom dead, though his former ally Rolento believes he may have survived.
Video game journalist Drew Mackie suggested the name may reference the German heavy metal band Sodom, consistent with other Mad Gear characters who carried similarly themed names. Mackie also noted the Japanese developers may have been unaware of the name's biblical connotations at the time of Final Fight's release, as the term is a loan word in Japan.