Anyone have any videos similar to these?

https://www.youtube.com/watch?v=ndQGbl8Wn9E
https://www.youtube.com/watch?v=4lnSDkZ0iN0
https://www.youtube.com/watch?v=11be-5Xq3J0
https://www.youtube.com/watch?v=AuTR2OaeidU
https://www.youtube.com/watch?v=VCDoK0E_4K4

Where one anime is being crossed over with another anime's OP? I'll take anything, but I'd like to see ones that try and copy the style by drawing the characters from one anime ONTO the characters from the OP, as opposed to lazily putting scenes from the anime as part of the OP, although I'll take those too.

Sometimes videos might be on niconico, like this one. So I'm okay with any video links.
https://www.nicovideo.jp/watch/sm22598325

Thanks in advance.