A is for the Axanar
B is for Big Boobed Borg Babes By Berman & Braga.
C is for The Celestial Temple.
D is for Data
E is for Exeter.
F is for Fionnula Flanagan aka Juliana Tainer aka Enina Tandro aka V'Lar.
G is for the Gorn, nasty lizard-like aliens.
H is for Harry 'the eternal Ensign' Kim.
I is for the Indigenous lifeforms that all the Enterprises encountered many times.
J is for Jadzia Dax.
K is for Kahn.
L is for Looney starship captains.
M is for Megas-Tu, home of the Megans, who all know magic.
N is for the Nanites that according to Beverly Crusher could be all that's left of the federation after the Borg were done with it.
O is for Odo or O'Brien. Or both of them if you want.
P is for Paris, a lieutenant on Voyager.