Freddy Krueger
Fennec Shand (Sometimes)
Freedon Nadd (Star Wars)
Firefly (DC)
Firelord Ozai
Fenrir Greyback (Harry Potter)
Fenrir/Fenris (Marvel)
(The) Fallen (Transformers)
Fin Fang Foom
Frieza
Fabian Cortez (Marvel)
Flip (Yu-Gi-Oh Zexal, briefly)
Fjor (Ragnarok, on and off)
Farquad
Fifth Brother
Frank Weaver
Frankenstein's monster (This one's debatable, depends on the interpretation)
Frenzy (Transformers)
Felix Faust (DC)
