Best: FE4 Hell. Creepy as shit.
Honorable Mentions: Narga, Lopto, Torhammer, Apocalypse, Luna, FE7!Excalibur, Rexflame, Cymbeline, Rexcalibur, FE4!Resire, FE4!Thoron
Worst: FE9!Nosferatu. It's so boring compared to the others.
Dishonorable Mentions: GBA!Fire, FE9!Light Magic, GBA!Lightning