Anyone who knows of Lucky Star also knows of the tons of remixes that have ended up on Nico Nico Douga and subsequently Youtube. While some are basically remixes that overlap songs, a few stand out and are copied ad nauseam with other characters. Here's my latest finds based on the Lucky Star version of the Paffendorf (Under My Skin) mix. With X and Zero With Mega Man and Bass... Here's an interesting take on the mix: Actual changes to the video!
...and here's one based on the original Paffendorf mix animation.