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You are asking about people who were regarded literally as "the Messiah", not as a "saviour" or "divinity", right? Then we need to mention the late Lubavitcher Rebbe, Menachem Schneerson, whose followers regarded him as the Messiah, a claim which he rejected. An involuntary Messiah.
Upvote:3
Another movement with an involuntary divinity - not exactly a Messiah - is Prince Philip Movement. Some people in a village in Vanuatu seem to believe that the Duke of Edinburgh is a divine being.
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Jiddu Krishnamurti was believed to be a sort of messiah (the 'World Teacher') by the Theosophists. In the 1920s he disavowed this idea and dissolved the organisation that had been established to support it.