I clicked this thread to link the Hey Mickey parody only to find it was the first post, lol. Since that link is broken I'll
link to the original.
niconico has all the best videos imo, this
fake anime OP is amazing. if you want to find more of these kinds of videos just search "手書き FF7" (手書き = "hand-drawn")
if you've been a Kingdom Hearts fan for a long time you might remember Organization LIX, a group that made audio drama parodies of Org XIII, but they also did a few for Crisis Core:
https://www.schala-kitty.net/orglix/crisis/ they have a whole site for it that's still up
also, this classic:
(if in the future any of these are broken, contact me for the files, I have everything downloaded)