I was shocked and disappointed when J.K. Rowling posted on her website that the character Mark Evans has absolutely no significance; the fact that he shares a last name with Harry’s mother’s maiden name was a mistake on her part and does not matter at all. I was on the point of cardiac arrest, as I had developed so many complex theories involving Mark Evans, before I got to grips and realized that I ought to re-read what Rowling said on her site. An in-depth analysis of her exact wording forces me to believe otherwise. She wrote: “Mark Evans is… nobody. He’s nobody in the sense that Mr. Prentice, Madam Marsh and Gordon-Dudley’s-gang-member are nobodies.” This statement of Rowling’s has not led me to believe that Mark Evans is a nobody, but that Mr. Prentice, Madam Marsh, and Gordon are all much more important characters than one immediately realizes. Essentially I believe that Mr. Prentice is with the Order of the Phoenix, Madam Marsh is a Voldemort-supporter, and Gordon is a Squib, although the first two theories are better supported than the latter. This is the foundation for my theory:
When Mrs. Figg saw Mr. Prentice walking down Privet Drive after the dementor attack in the beginning of Order of the Phoenix, she said “Who’s that? Oh, it’s just Mr. Prentice.” The statement “Oh, it’s just Mr. Prentice” is NOT the same as the statement “It’s Mr. Prentice.” I believe that the words “oh” and “just” are highly significant, and may have a hidden implication that Mr. Prentice is not dangerous to wizards in the sense that doing magic in front of him would violate the Statute of Secrecy. In other words, I believe that Mr. Prentice is a wizard. Not only do I think he is a wizard, I also believe that he is an Animagus in the form of one of Mrs. Figg’s cats, specifically Mr. Tibbles. Mrs. Figg explained to Harry in chapter one of Order of the Phoenix that she knew that Mundungus Fletcher had Disapparated in front of number four, Privet Drive because she had stationed Mr. Tibbles underneath a car to keep a lookout. How could she instruct an ordinary cat to remain hidden like that, and how would an ordinary cat possibly understand her? I believe that Mr. Tibbles is a wizard.
Madam Marsh is clearly a supporter of Voldemort. We have seen her both of Harry’s two times on the Knight Bus, and both times she had been feeling badly – violently sick, in fact. I suspect that she is trailing Harry; otherwise, why would she be turning up on the Knight Bus so often? Why would you bother traveling on the Knight Bus when you have Apparation as an alternative and it makes you feel so ill if you are not stalking somebody? It could be argued that Madam Marsh is a member of the Order who is supposed to be keeping an eye on Harry, but I have a feeling that Dumbledore would not force a member of the Order to go on the Knight Bus all the time if it made them feel so sick. With Voldemort, on the other hand, you obey his orders or die. It is therefore reasonable to believe that Madam Marsh is spying on Harry on Voldemort’s orders.
Gordon, the member of Dudley’s gang, is the hardest character of these three to figure out, as he is mentioned very rarely. He is mentioned, however, in Order of the Phoenix, in which he invites Dudley and the gang over to his house because his “parents are out.” My only guess is that his parents could be wizards, perhaps visiting Diagon Alley or something? Although this theory is unfounded, I also hypothesize that Gordon is The Metamorphmagus of book six – don’t ask me why I think this, I have no idea why I am drawn to this particular peripheral character – but it is very clear to me that we have not seen the last of Metamorphmagi. We learned briefly about Animagi in class with Professor McGonagall after the first Divination lesson in the third book, and later learned that this was the secret of the Marauder’s Map/Sirius/Pettigrew/Shrieking Shack/Lupin’s absences from class mystery. We found out about Polyjuice Potion in the second book when Harry and Ron impersonated Crabbe and Goyle to later discover that it was Barty Crouch’s method of disguise as well. Nothing in the series is revealed without a reason, and I don’t think that the reason we learned about Metamorphmagi was to have some entertainment with Tonks changing her nose over dinner.
Due to this reasoning, I believe that Mark Evans may well be a very important character in book six, a possible relation of Harry’s, and remains in contention for the role of half blood prince.