A remarkable outdoor advertising campaign by KFC, using images of the shopfronts of imitating fast food chains, paired with the barest version possible of the KFC logo and an ironic phrase “Guys, we’re flattered” using a yet unrecognized sans serif.
If others are copying your brand you can send a cease and desist letter, or you can use it in an advertising campaign. Kentucky Fried Chicken must have thought the latter. —Erwin Hauër, Knijff Trademark Attorneys
KFC’s own logo is custom. Each imitation pairs a KFC-like acronym with its own lettering or font choice. It appears that there were some different approaches to making an imitation. Some approximated the 1991–1997 KFC logo – either by using its letters when possible, or by using the similar Friz Quadrata: CFC, IFC, LFC, NFC, OFC. Some simply used Cooper Black, as it is a widely available typeface and much used by fast food shops/chains: BFC, DFC, HFC, ZFC. There’s ITC American Typewriter, which approximates the 1978–1991 KFC logo: GFC, TFC. Others use FB Agency with added stroke and outline: EFC, MFC, SFC, XFC; or what looks like Clarendon: FFC, JFC, PFC; or a grotesk (Helvetica?): QFC, UFC, WFC, YFC.
The most unique one in my opinion is clearly RFC, followed by AFC and VFC.
AFC: lettering or type?
BFC: Cooper Black
CFC: based on the 1991–1997 KFC logo (C repeated)
DFC: Cooper Black
EFC: FB Agency
GFC: American Typewriter
HFC: Cooper Black
IFC: based on the 1991–1997 KFC logo (I created by cutting the F)
JFC: Clarendon oblique
LFC: seems based on Albertus [or Friz Quadrata, see comments]
MFC: FB Agency
NFC: seems based on Albertus
OFC: based on the 1991–1997 KFC logo (O is a circle with a chicken in it)
QFC: similar to Helvetica Black
SFC: FB Agency
TFC: American Typewriter
VFC: similar to Rockwell Extra Bold
XFC: FB Agency
ZFC: Cooper Black