Barret is the 35-year-old leader of the rebel team known as AVALANCHE.  He leads the team in a quest to stop Shin-Ra's mako reactors and save the life of the planet.  Although he is truly devoted to the team, Barret often regrets having to leave his young daughter, Marlene, alone or in the care of others.  Barret's motives are unclear, but most believe that Shin-Ra was somehow responsible for the death of his wife.

Level 1:  Big Shot-- Barret fires a large ball of energy from his gun, which causes massive damage to his opponent.  For the first portion of the game Big Shot should come in really handy, but it quickly becomes obsolete as your enemies increase in strength.  Mindblow-- Barret fires a large ball of blue energy from his gun, which deplete's his opponent's magic points.  Such attacks often go unappreciated, but the Mindblow can turn a fierce magic user into a helpless wimp.
Level 2:  Grenade Bomb-- Targeting an entire group of enemies, Barret launches a deadly grenade into the enemy ranks.  This is typically the Level 2 Limit Break of choice.  It causes a decent amaount of damage to entire groups of enemies.  Hammerblow-- Barret's powerful punch sends an enemy into orbit.  Barret can completely remove an enemy from cobat with the Hammerblow, but the attack is best used against individual non-Boss monsters.  The Hammerblow doesn't cause any direct damage, so it's worthless against Boss creatures.
Level 3:  Satellite Beam-- Proving he has friends in high places, Barret calls for the ultimate air strike against a group of enemies.  The beams hit for about 3000-4000 points of damage on each creature.  Although this attack is great against a group of enemies, it's considerably less effective against a lone attacker.  Ungarmax-- Lock and load!  Barret dumps a large amount of ammunition into a group of enemies causing massive damage.  The Ungarmax hits more times than the satellite beam, but the attacks are weaker.
Level 4:  Catastrophe-- Revisit North Corel once Meteor has been summoned and speak to the lady in the middle house on the west side of town.  She'll give Cloud the Catastrophe for Barret's Limit Break.  Barret uses his gun arm to hover over a group of enemies, and then burns them to a crisp with a super-heated plasma blast.  As you might expect, this is the best of Barret's Limit Breaks.  It works well against a group or a single enemy.  It does have one downside: because this attack isn't focused, a single enemy won't feel the full force of the blow.