I just have an idea about the toothless dancing meme, the covers are RichaadEB Feat. A_A_RonHDYT! But, scince, A_A_RonHDYT's remix is in a fast tempo while RichaadEB is a normal tempo.

Covers that respectively belongs to the owners:

Metal Cover by RichaadEB
Smash Bros. Remix by A_A_RonHDYT

Thanks to them for their covers.