Below is a detailed listing of all of the Espers in Final Fantasy VI. This list also includes the four additional espers found in Final Fantasy VI Advance; the Gameboy Advance re-release. Espers play a quintessential role in Final Fantasy VI, they are the source of all Magic and can help your party members learn Magic. Just as well, their use is also as a Summon, they can be summoned into battle to preform their ability or effect. Each Esper helps a character that its equipped to learn a specific set of Magic. Once equipped, at each level-up for your characters, they can recieve bonuses at each new level interval. It's also better to have a diverse range of Espers equipped to different characters to have a balanced team that uses Espers and Magic.

Ramuh
Effect	Element	Level Up Bonus	Obtain
Judgement Bolt	Thunder	Stamina +1	Zozo
Magic Taught			Rate
Thunder			x 10
Thundara			x 2
Poison			x 5
Kirin
Effect	Element	Level Up Bonus	Obtain
Holy Aura	-	-	Zozo
Magic Taught			Rate
Cure			x 5
Cura			x 1
Regen			x 3
Poisona			x 4
Libra			x 5
Siren
Effect	Element	Level Up Bonus	Obtain
Lunatic Voice	-	HP+10%	Zozo
Magic Taught			Rate
Sleep			x 10
Silence			x 8
Slow			x 7
Fire			x 6
Cait Sith
Effect	Element	Level Up Bonus	Obtain
Cat Rain	-	MP +1	Zozo
Magic Taught			Rate
Confuse			x 7
Imp			x 5
Float			x 2
Ifrit
Effect	Element	Level Up Bonus	Obtain
Hellfire	Fire	Strength +1	Magitek Reasearch Facility
Magic Taught			Rate
Fire			x 10
Fira			x 5
Drain			x 1
Shiva
Effect	Element	Level Up Bonus	Obtain
Diamond Dust	Ice	N/A	Magitek Reasearch Facility
Magic Taught			Rate
Blizzard			x 10
Blizzara			x 5
Rasp			x 4
Osmose			x 4
Cure			x 3
Unicorn
Effect	Element	Level Up Bonus	Obtain
Healing Horn	-	N/A	Magitek Reasearch Facility
Magic Taught			Rate
Cura			x 4
Esuna			x 3
Dispel			x 2
Protect			x 1
Shell			x 1
Maduin
Effect	Element	Level Up Bonus	Obtain
Chaos Wave	-	Magic+ 1	Magitek Reasearch Facility
Magic Taught			Rate
Fira			x 3
Blizzara			x 3
Thundara			x 3
Catoblepas
Effect	Element	Level Up Bonus	Obtain
Demon Eye	-	HP +10%	Magitek Reasearch Facility
Magic Taught			Rate
Bio			x 8
Break			x 5
Death			x 2
Phantom
Effect	Element	Level Up Bonus	Obtain
Ghostly Veil	-	MP +10%	Magitek Reasearch Facility
Magic Taught			Rate
Berserk			x 3
Vanish			x 3
Gravity			x 5
Carbuncle
Effect	Element	Level Up Bonus	Obtain
Ruby Light	-	MP +10%	Magitek Reasearch Facility
Magic Taught			Rate
Reflect			x 5
Haste			x 3
Shell			x 2
Protect			x 2
Teleport			x 2
Bismarck
Effect	Element	Level Up Bonus	Obtain
Breach Blast	-	Strength +2	Magitek Reasearch Facility
Magic Taught			Rate
Fire			x 20
Blizzard			x 20
Thunder			x 20
Raise			x 2
Golem
Effect	Element	Level Up Bonus	Obtain
Earthen Wall	-	Stamina +2	Jidoor Auction House
Magic Taught			Rate
Protect			x 5
Stop			x 5
Cura			x 5
Zona Seeker
Effect	Element	Level Up Bonus	Obtain
Magic Shield	-	Magic +2	Jidoor Auction House
Magic Taught			Rate
Rasp			x 20
Osmose			x 15
Shell			x 5
Seraph
Effect	Element	Level Up Bonus	Obtain
Angel Feathers	-	N/A	Tzen
Magic Taught			Rate
Raise			x 5
Cura			x 8
Cure			x 20
Regen			x 10
Esuna			x 4
Quetzalli
Effect	Element	Level Up Bonus	Obtain
Sonic Dive	-	-	Solitary Island
Magic Taught			Rate
Haste			x 20
Slow			x 20
Hastega			x 2
Slowga			x 2
Float			x 5
Fenrir
Effect	Element	Level Up Bonus	Obtain
Howling Moon	-	MP +30%	Mobliz
Magic Taught			Rate
Teleport			x 10
Banish			x 5
Stop			x 3
Valigarmanda
Effect	Element	Level Up Bonus	Obtain
Tri-Diaster	-	Magic +2	Narshe
Magic Taught			Rate
Firaga			x 1
Blizzaga			x 1
Thundaga			x 1
Midgardsormr
Effect	Element	Level Up Bonus	Obtain
Abyssal Maw	-	HP +30%	Narshe Mines
Magic Taught			Rate
Quake			x 10
Graviga			x 5
Tornado			x 3
Lakshmi
Effect	Element	Level Up Bonus	Obtain
Alluring Embrace	-	Stamina +2	Owzer's Mansion
Magic Taught			Rate
Cure			x 25
Cura			x 16
Curaga			x 1
Regen			x 20
Esuna			x 20
Alexander
Effect	Element	Level Up Bonus	Obtain
Divine Judgement	-	-	Doma Castle
Magic Taught			Rate
Holy			x 2
Shell			x 10
Protect			x 10
Dispel			x 10
Esuna			x 15
Phoenix
Effect	Element	Level Up Bonus	Obtain
Flame of Rebirth	-	-	Phoenix Cave
Magic Taught			Rate
Raise			x 10
Arise			x 2
Reraise			x 1
Curaga			x 2
Firaga			x 3
Odin
Effect	Element	Level Up Bonus	Obtain
Zantetsuken	-	Speed +1	Anicent Castle
Magic Taught			Rate
Meteor			x 1
Bahamut
Effect	Element	Level Up Bonus	Obtain
Flare	-	HP +50%	Overworld (After Deathgaze)
Magic Taught			Rate
Flare			x 2
Ragnarok
Effect	Element	Level Up Bonus	Obtain
Metamorphose	-	-	Narhse with Locke
Magic Taught			Rate
Ultima			x 1
Crusader
Effect	Element	Level Up Bonus	Obtain
Cleansing	-	MP + 50%	Defeat all 8 Dragons
Magic Taught			Rate
Meltdown			x 1
Meteor			x 10
Raiden
Effect	Element	Level Up Bonus	Obtain
Shin-Zantetsuken	-	Strength +2	Anicent Castle
Magic Taught			Rate
Quick			x 1
Leviathan
Effect	Element	Level Up Bonus	Obtain
Flood	-	Stamina +2	South Figaro and Nikeah Ferry
Magic Taught			Rate
Flood			x 2
Cactuar
Effect	Element	Level Up Bonus	Obtain
1000 Needles	-	Speed +2	Desert Southwest of Maranda
Magic Taught			Rate
Teleport			x 20
Vanish			x 10
Hastega			x 5
Diablos
Effect	Element	Level Up Bonus	Obtain
Dark Messenger	-	HP + 100%	Dragon's Den
Magic Taught			Rate
Graviga			x 5
Gravija			x 3
Gilgamesh
Effect	Element	Level Up Bonus	Obtain
???	-	Strength +2	Coliseum (Wager Excalipoor
Magic Taught			Rate
Quick			x 1
Valor			x 5