Secondary summons are supposed to be the equivalent of foot soldiers; they're quite easy to dispatch but the advantage in them is when the Summoner fights alongside them. Just so you know, they're not that difficult to dispatch. A grand summon, on the other hand, is extremely difficult to defeat.

Your profile looks great, but Charos is overpowered. If you're willing to let him take damage, then I can approve you. Since he can't take damage and is used for healing, the summoner will be pretty much unstoppable. Besides that, I love the rest!