Midori no Akuma

This is one of the funniest video series I have ever seen on Nico. They started in the end of 2008, but many English speakers discovered these videos in the middle of 2010.

To begin, it's a jikkyou play, which is kind of like the "Let's Play" series of videos that you see all the time on Youtube, where people commentate while playing through games. Two Japanese dudes commentate themselves playing through Super Mario 64. Except that they are playing the roles of 2 samurai from the Bakumatsu period, 坂本龍馬(Sakamoto Ryoma) and 西郷隆盛(Saigo Takamori). They speak in an odd dialect of 19th century Japanese, and talk of Mario-samurai's quest to defeat the Midori no Akuma(aka green demon).

Basically they invent a game within Super Mario 64 where throughout certain levels, they activate a 1UP mushroom and attempt to clear the level by gathering all 8 red coins and the star, while being chased down by the "green demon". Except that I remember the 1up mushrooms would actually run away from Mario when I played, so maybe this is something exclusive to the Japanese version of the game. In any case, it's quite a spectacle and it's amazing what that little 1up mushroom is really capable of.

Introduction and playthrough of Bob-omb Battlefield



Cool, Cool Mountain



Whomp's Fortress


Shifting Sand Land


Someone also uploaded them on Youtube as well
Playlist