SuperMarioGlitchy4 is the most popular Super Mario 64 machinimist. His bloopers are somewhat innapropriate, but no one can really doubt that they're funny.
SMG4's bloopers are, as mentioned before, somewhat inappropriate but funny. One of them was a parody of the Like A Boss song. Some feature SuperMarioGlitchy3 and Bowser as the main villain. Others show someone getting on drugs or something along those lines.
In XF997's Zombie Invasion, SMG4 starts to appear in Episode 2 as a "hobo". He has had a small role so far, but more will be added when Zombie Invasion progresses
SuperMarioGlitchy4 has had little or no role in Super Mario: Dark Times yet, other than being one of the 10 main characters that survive.