Mit
Smash Ace
I investigated that one as well.How about the MK texture, same video?
It's by Dancingroundtheworld, a newer addition to StackSmash's texture hack team (he goes by the name Lexx on StackSmash, if you search videos for Dancingroundtheworld you'll find a lot of videos of his textures, including that Meta Knight texture, which he calls Blue Meta Knight or something). He has a lot of textures available for download here, but the Meta Knight one is not available (although he has some kickass Yoshi's Island textures).
It looks like he is also someone who needs to be badgered for that Meta Knight texture, unless someone can find it.