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I'm pretty sure Quistis' blue magic used MP to use, and Kimahri's may have as well. It really depends on the game and how its magic system worked
Neither Khimari nor Quistis required MP to use their skills. Both were Limit Breaks and there was no MP in FFVIII.
I don't know if there were blue mages in FFIII, but,
FFV - Required you to have the Learning ability (or being a Blue Mage job itself) and you must be hit with the ability to learn it. Spells then required MP to use.
FFVI - Strago had to be hit with the spell to learn it, and then it cost MP to use.
FFVII - Required the Enemy Skill materia to be equipped and that person with it had to be hit with the ability to learn it, and then it cost MP to use.
FFVIII - Required the enemy to drop an item that could teach Quistis the ability. Quistis must Limit Break to use it.
FFIX - Required you to weaken the enemy to have Quina eat it and then learn it, and then it cost MP to use.
FFX - Required you to Lancet the enemy with the skill to learn it. Kimahri must Overdrive to use it.
FFTA - This one I only remember vaguely. There was a skill called Learning, so if I remember correctly it's the same as FFV. FFTA was so awful I barely remember most if it though (Assassin for the win).
FFV, VI, VII, and FFTA required you to be hit with the ability to learn it and required MP to use. FFIX learned the abilities differently but still required MP to use.
FFVIII and FFX were the oddballs. You learned and used blue magic differently in these games.
Although they may come up with a new system for XI, we'll likely see MP being used.