Solid Snake is a recurring bit character in Sgt Frog Abridged. He will randomly pop his head in from off-screen to reference the Metal Gear Solid series, usually under the guise of it being advice. It is revealed in Episode 7 that this is apparently his job: he sits in front of a computer in a cave in the far-off planet Doinaka, waiting for someone to make a mistake. He will then teleport to their location to say something before immediately disappearing again.
Viper: *Fires his arm cannon* "Okay, how the fuck did I miss a picture?!" Snake: "Plug into the second controller port!" - Episode 4
Momoka: "Beautiful, isn't it? It just grew here all of a sudden a few weeks back. I don't even know where it came from." Paul: "I was just fixing my socks. I didn't think that would happen!" Snake: "Even love can bloom on the battlefield!" Dororo: "Shut up!" - Episode 10