Hi I’m looking for stories where a person or pony is transformed into a monster that looks like a pony or a human. For example, a vampire, zombie, or ghost

7949975
Does this count?

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7949975
ever read A Hairy Problem? some of the sequels got a little crazy but...well, AJ is a Werewolf...

There are dozens. If you go through the groups, there are dedicated pages to collating them. I'm partial to: https://www.fimfiction.net/story/36388/my-roommate-is-a-vampire
Good luck!

This vary group has folders dedicated to such... nearly 500 if we take out the "changeling" stories.