Sakura Ganbaru!
Maki makes an appearance as one of Sakura's opponents in this manga.

Street Fighter III: Ryu Final
In this manga series, Poison and Hugo make a few appearances.

Street Fighter Alpha: The Animation
A few Final Fight characters make small appearances in this anime film.

Street Fighter
Final Fight characters make a few appearances in this cartoon series, and there is even an episode based on the original Fight Fight's story!

Street Fighter Alpha
Guy and Sodom appear in this manga adaption of Street Fighter Alpha.

Udon Entertainment
Several Final Fight characters appear in Udon's Street Fighter comic book series.