Okay Everyone has to come up with their own limit breaks, but here is how it will work in battle.

First of all determine how large your limit gauge is. This is done by taking 4/5 of your max hp. For example, My max hp is 60 so 60x4/5 is 48 therefor my limit gauge goes to 48. Now when ever I take 48 damage (restoritive items and spells don't affect your limit gauge) I can do my limit break. You have to create your own Limit breaks. For example mine is called Aura Beam, and it attacks one enemy. Limit breaks can cause up to 2x regular fight damage or can cause status changes (in enemies or allies).