Who has seen a legendary fictional character?

Space aliens, bigfoot, Nessie, there are many strange creatures considered by most to not exist, but still there are so many who claim to have seen them. I have no desire to judge. I am not on a witch hunt. (Have you ever met a witch? Ex wives don’t count) I am just curious.
Also, if you know one you think maybe we haven’t heard of, please introduce us.