Espers

Centuries ago, 3 gods were banished to this planet. In no time, they began fighting. Those humans that got in the way, were turned into Espers. Espers, at first, were welcome among humans. But 1,000 years ago, the great war of the magi occurred. After this disastrous war, Espers sealed themselves way, in a hidden realm. There they lived quietly in peace, until the Emperor made his way there.

Espers are Final Fantasy VI's version of summons. There are more summons in Final fantasy VI, than any other title to date. In the GBA version, you can gather 31 Espers scattered throughout the game.
While the Esper is equipped, you can then begin to learn the spells they teach. After each battle, you will get AP. This AP is put towards learning the spell. For example, if you have Bahamut equipped, and you gain 10 AP, you will actually get 20 AP. This is due to the spell having a learn rate of x2. Also most Espers grant certain bonuses when you level up. Crusader, for example will increase your MP by 30%, every time you level up with it equipped. Below are the Espers, the magic they teach, and the bonuses you get when you level up. Try them out, and see what is best for you.

NAME ATTACK MP Alexander Divine Judgment 90 LEVEL BONUS: - Doma Castle: W.O.R SPELLS LEARN RATE Holy x2 Protect x10 Shell x10 Dispel x10 Esuna x15	NAME ATTACK MP Bahamut Mega Flare J 80 LEVEL BONUS: HP+50% J Defeat Doomgaze W.O.R. SPELLS LEARN RATE Flare x2 - - - - - - - -
NAME ATTACK MP Bismarck Breach Blast 50 LEVEL BONUS: Vigor +2 Magi-Tek Facility W.O.B SPELLS LEARN RATE Fire x20 Blizzard x20 Thunder x20 Raise x2 - -	NAME ATTACK MP Carbunkle Ruby Light 36 LEVEL BONUS: - Magi-Tek Facility W.O.B SPELLS LEARN RATE Reflect x5 Haste x3 Shell x2 Safe x2 Teleport x2
NAME ATTACK MP Crusader Cleansing 96 LEVEL BONUS: MP +30% Defeat 8 Legendary Dragons W.O.R. SPELLS LEARN RATE Meteor x10 Meltdown x1 - - - - - -	NAME ATTACK MP Fenrir Howling Moon 70 LEVEL BONUS: MP + 30% Defeat Phunbaba first round W.O.R. SPELLS LEARN RATE Teleport x10 Banish x5 Stop x3 - - - -
NAME ATTACK MP Golem Earthen Wall 33 LEVEL BONUS: Stamina +2 Auction House for 20,000 GP SPELLS LEARN RATE Protect x5 Stop x5 Cura x5 - - - -	NAME ATTACK MP Ifrit Hellfire 26 LEVEL BONUS: Vigor +1 Defeat in Magi-Tek Facility W.O.B. SPELLS LEARN RATE Fire x10 Fira x5 Drain x1 - - - -
NAME ATTACK MP Kirin Holy Aura 18 LEVEL BONUS: - Zozo in Terra's room W.O.B. SPELLS LEARN RATE Cure x5 Cura x1 Regen x3 Poisona x4 Scan x5	NAME ATTACK MP Maduin Chaos Wave 44 LEVEL BONUS: Mag. Power +1 Magi-Tek Facility W.O.B. SPELLS LEARN RATE Fira x3 Blizzara x3 Thundara x3 - - - -
NAME ATTACK MP Odin Zantetsuken 70 LEVEL BONUS: Speed +1 Ancient Castle throne room W.O.R. SPELLS LEARN RATE Meteor x1 - - - - - - - -	NAME ATTACK MP Quetzalli Sonic Dive 61 LEVEL BONUS: - Second trip to Solitary Island W.O.R SPELLS LEARN RATE Haste x20 Slow x20 Hastega x2 Slowga x2 Float x5
NAME ATTACK MP Phantom Ghostly Veil J 38 LEVEL BONUS: MP +10% Magi-Tek Facility W.O.B. SPELLS LEARN RATE Gravity x5 Berserk x3 Vanish x3 - - - -	NAME ATTACK MP Phoenix Flames of Rebirth 110 LEVEL BONUS: - Phoenix Cave W.O.R. SPELLS LEARN RATE Raise x10 Arise x2 Reraise x1 Curaga x2 Firaga x3
NAME ATTACK MP Ragnarok Metamorph 6 LEVEL BONUS: - Narshe weapon shop w/Locke W.O.R. SPELLS LEARN RATE Ultima x1 - - - - - - - -	NAME ATTACK MP Raiden Shin-Zantetsuken