OK so what are your possibilities.

YOU are the legal owner of YOUR videos. YOU own the copyright to them. HOWEVER … YOUR videos contain footage which is copyrighted by LFL/Disney (or Fox). Do you have your videos monetized? You might be protected under fair use.

I would personally try to reach the guy personally and request that he takes down his videos (especially if he monetizes them), if he ignores your request I would send an official DMCA takedown request. However this might be tricky, he can send a counter request, which means you would be required to sue him in the end. And if this would get to court you might get into problems too.

Regarding comparison videos - I have a youtube channel with Star Trek comparison videos, all of them were claimed by CBS. I have actually contacted two real copyright attorneys, one of them claimed that my videos are 100% fair use, the other one claimed that my comparison videos MIGHT be considered fair use, but a judge would have to decide it in court, because I just like you didn’t provide any criticism, commentary, or parody.