Chopper is the best... From ac5 But Also Fiona Fitzgerald... From ac3
My favorite is Rena Hirose. She is sweet and tender while on your side, but going on a dogfight against her on the X-49 is like opening the gates of hell. She's skilled, difficult to shoot down, but it's not impossible beat her. Unlike Sulejmani, the cheap bastard.
Gryphus 1.
Personally, I just love how he, whoever the hell he is, took back Aurelia and annihilated Leasath without effective backup.
Argue with me all you want, but on some missions, Mobius 1 still has somewhat skilled backup... not to mention, ACX has the Gleipnir, a ground-to-air Shock Cannon, and more; all beaten by Gryphus one.
Feel free to argue.
Cipher (ACZ)
He single handedly turned the tide of the greatest war in recent Strangereal history, and it's possible to change who he was by your own actions. Besides, tell me it's not badass to win a war, take down your own rebel wingman and destroy the world's biggest nuke in a matter of months.