I'll just do the games that stand out the most for me.

FFIV: Edward, obviously. A coward, a wimp, and "royalty". He's like the prince from Braveheart.
FFVI: Strago. Relm was close, but at least her Magic Power slightly redeemed her. Strago just all-around sucked, and it was too much of an inconvenience to learn his Lores.
FFVII: Aeris. Not only did she suck, but she was made out to be such a great character. Boo. Hoo.
FFX: Kimahri. Sorry buddy, I just didn't need you. Already had people with speed, already had people with strength, and already had people with magic, so you were completely useless until everybody got strong and even Rikku did 9999.