Thread:Myself 123/@comment-6576725-20150526045808/@comment-477304-20150526135330

There are two reasons to equip espers: 1. To learn magic. 2. To boost base stats. I'm not familiar enough to know which espers boost which stats. Spells are of course less important for Gau, whilst Celes will benefit from them. There is an upcoming boss who will change his magical immunities periodically, so knowing the three basic elements will help. Casting sleep on him will also work. You should also have attained some elemental swords at this point, they may be a hindrance during the battle, so it may be better to remove them for the battle.

When it comes to boosting stats, the best thing to do would be to check your characters' stats and make a judgement on which stats should get a boost. Personally, I would recommend boosting a character's strongest attribute, but it's up to you.