I watch a lot of AMVs in general, and because I am a big fan here I also tend to look specifically for AMVs that use Key animes. Out of this whole thread tho, I only recognized three well-known edits.
The End Of My World by xDieguitoAMV, using Clannad (he’s a wonderful editor by the way), and KEY.s.LIFE, a multi-editor project by a group of Japanese editors on nicovideo. That AMV is fun to watch no matter how many times one would replay it, haha. And the えくすて, a much older MAD from 2008 using the Little Busters VN.
Whether that’s a sad thing or not, I’m not sure… but I’ve checked a lot of other edits in this thread and a lot of them was… errr… irky to watch to the end. Others were parodies, too much of them, lol. They are fun to watch I guess. There were a few good MADs here and there but they were from suspicious channels with suspicious titles. Ah, oh yeah, that Angel Beats MAD titled 砂時計、最後の一粒 that a previous poster posted was also a really good one. That MAD was edited by the well-known ぐんま, and he was using 1st BEAT of the VN. I would recommend watching it.
So back on topic, Clannad’s anime adaption is known to be the most popular, so of course there would be an absurd amount of uploaded AMVs using it on youtube every year. It would be difficult to find the AMVs you would invest your emotions to. So first, I want to share specific playlists of a channel consisting of a team that I’m a part of, that creates playlists to distinguish the wonderful AMVs worth investing and also technically well done at the same time from the average batch. Luckily, there were playlists created for many of the Key animes:
Clannad has 32 AMVs, and not surprising it being the biggest out of the other playlists here.
Little Busters playlist has 23 AMVs
Air TV has 5 AMVs.
Kanon 2006 has 12 AMVs (I haven’t not once seen a good AMV of Kanon 2002)
Charlotte has 5 AMVs
It’s really, really, difficult to choose like the best one to represent the playlists, so I can only ask that everyone check the whole playlist and all the AMVs contained in it.
As for a few extras, I’ll post these this they are not involved with the playlists:
This AMV used the visual novel, Harmonia. It’s slow, but I think it’s enjoyable.
This is a really beautiful MAD based on Tomoyo After
A fun MAD based on Kud Wafter
This Rewrite MAD is my all-time favorite for the Rewrite VN.
This Rewrite MAD is my next favorite, from how much the telling of the story and animation of CG is done with the visual novel sprites alone
Same with this one, same creator
This a slower more mood-important Rewrite MAD edited by a member of Mirai Mad Team
There doesn’t seem to be a playlist for the Rewrite anime yet. Hopefully in the future, that will change.
I hope this post was helpful!