some peculiar fan community nicknames

• Avatards (Avatar: The Last Airbender or Avatar)
• Buffistas (Buffy the Vampire Slayer)
• Daisy-Pushers (Pushing Daisies) 
• Darklings (Darkwing Duck)
• Dunderheads (US version of The Office)
• Gleeks (Glee)
• Heroes or Colbert Nation (The Colbert Report) 
• Leaper (Quantum Leap)
• Lostralians (Lost)
• Pokémaniac (Pokémon)
• Sidekicks (Heroes)
• Transfans (Transformers)
• Wheel Watchers (Wheel of Fortune)
• Wingnuts (The West Wing)
• Whovians (Doctor Who)
• X-Philes (The X-Files)
• Xenites (Xena: Warrior Princess)

transfans?

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for a whole lot more (including fans of bands, movies, and videogames): tvtropes.org