Fan/supporter of a celebrity or a group of celebrities that likes to be a secret and quiet supporter instead of trying to gain the celebrity's attention whenever they appear in a fan-meeting or in other situations
"You're never going to get a high five from xxx idol if you continue to be an invisifan."
"Idols appreciate outgoing fans, not invisifans."
"Don't be such an invisifan"
"Invisifans are fans too"