SMB Madman is a fellow YouTube video creator who also makes games on Yoyogames and comics on Deviantart.
His main series include:
Mario Shorts (Fanmade)
Dr. Otto's Epic Advenchures
Dr. Otto (Made with Flipnote Studio)
His own Let's Play series
The Greeny Phatom Show (see below)
Recently, on October 4th, 2012, SMB Madman obtained the rights for the Greeny Phatom series, as well as Luke City, Finley Small, Mr. Shaw, Geo's World, etc (along with their original creators, too) by copyrighting them all via a deviantart journal topic. He later stated in an interview that "I will put all these characters together into one show".
Simply titled "The Greeny Phatom Show", he plans on making it an animated sitcom series for YouTube.
The first episode(s) will be out on October 21st.