Brian Clevenger's '8-Bit Theater'
This comic has a refrence to Key-Fu I in one of its episodes; check out Episode 159: Getting Our Bearings Straight and look for the refrence to the Lone Green Midget!
Mäjken Gadouas' 'Words I Might Have Ate'
The refrence here might be more akin to a tribute. Read this day's comic of "WIMHA Lite" to see the artist's response to Key-Fu II!
Orochinagi Fighters series
This is a series of Infrequently Asked Questions (A FAQ, walkthrough and strategy guide to games that don't exist) based on the people of the Orochinagi community. Key-Fu himself has made an appearance in the series - check out his role in ONF3 and ONF4!