Jemainiac 

Any fan of Jemaine Clement from the musical duo Flight of the Conchords

Friend: Do you prefer Bret or Jemaine?
You: I think Jemaine is SO much funnier than Bret.
Friend: You're such a Jemainiac!

Jemainiac by Brol January 20, 2009

Remainiac

Person who voted for Britain to remain in the EU and is still desperately trying to undo the will of the electorate.

These people who want a second vote on EU membership are such remainiacs

Remainiac by hamster_man October 1, 2016

Remainiac

A patronising, usually London based, Guardian reading, pampered, luvvy who because of their self perceived intellectial ability, consider themselves above the rest of the voting public and as such, able to totally ignore the democratically expressed views of the British electorate.

THE BBC GOVERNING BOARD IS FULL OF REMAINIACS

Remainiac by Toadhalla June 12, 2018