1. Fan and follower of the character Agent Phil Coulson from the Marvel
Universe; somebody who is coulsonized.
2. Somebody who in spite of cinematic evidence believes in the survival of Agent Coulson.
3.
Person who concerns her/himself with coulsonistics.
(Note:
female Coulsonists are often referred to as "Coulsonites". Coulsonite is in fact a mineral containing iron and vanadium.)