In HPMOR, Voldemort is/was at some point in the form of a disembodied spirit.

Created by ygert on 2012-12-18; known on 2015-01-01; judged right by Unknowns on 2015-02-21.

• ygert estimated 60% on 2012-12-18
• Catmando estimated 50% and said “Until we know more about how he became Quirrelmort, it’s hard to say.” on 2012-12-20
• lavalamp estimated 51% on 2012-12-21
• gwern estimated 45% and said “not really consistent with the current narrative that the attack was thoroughly planned; being a spirit sounds risky” on 2012-12-23
• JoshuaZ estimated 55% on 2012-12-23
• darkdaemon estimated 70% on 2012-12-31
• Benja estimated 45% on 2013-02-10
• nigr estimated 99% on 2013-08-15
• ygert changed the deadline from “on 2014-01-01” on 2014-01-02
• jbluphin estimated 60% on 2014-02-01
• DEA7TH estimated 80% and said “It looks like he didn’t plan dying when he stroke Harry. The outcome of his Killing Curse looks significantly different from canon, but he still probably died from it. Even if he became Quirrell, why disappear at that exact moment?” on 2014-02-28
• player_03 estimated 40% and said “DE7TH: One reason would be to fool Dumbledore and co. And as gwern said, the attack and its aftermath was probably carefully planned.” on 2014-04-26
• dpchalmers estimated 80% on 2014-11-29
• Unknowns   judged this prediction right on 2015-02-21.
• Unknowns said “Judged this right because Quirrell responds in the affirmative in Parseltongue when Harry asks “So you really are a disembodied spirit possessing Quirinus Quirrell?”, implying he was disembodied before the possession.” on 2015-02-21