The word is not 'true' fan its

Die-Hard Fan:
Loves his club no matter what. Scream during matches and thinks the club's manager can listen to him through the TV Won't even wear a shirt of another club.

Glory Hunters:
People who support a team based on their honours. If they don't win the title for a few seasons, say bye bye.

Character Fans:
People who support characters in a club. And would not support the club if the person is not with the club any more. Eg. Mourinho leaving Chelsea and Beckham leaving Man Utd and RM.

Casual Fans:
They do not really care about the club. They support them because they like the way the club play. If the club stop playing the way they like they will support another club that can play the way they like. Not to be mixed up with Glory Hunters, these people do not care too much whether the club wins titles or not.