Hi, i have a memory of this comedy sketch (or i at least assume it was comedy) i watched on youtube as a kid. what i remember of the plot was a kid becoming linked to his Mii like a voodoo doll, and another guy (probably his brother) messing around with the mii, like throwing him around in the mii plaza and stuff. i'm pretty sure the video ended with the brother deleting the mii, and then realising the kid disappeared.
i think the video title was some variation on the phrase "be careful what you wish for" (maybe with a wii related pun, something like "be careful what you wiish for"), but its possible that was a different video, possibly by the same uploader. i think they might have had multiple similar sketch videos on the same channel.
the video was low budget obviously, i dont think the camera quality was great, and it might have been in 4:3, but that very well could just be me assuming stuff from having seen it so long ago at a young age.
if i had to guess, i probably saw it in 2012 or before, 2013 is very possible but i probably didnt watch it in 2014.