I had an idea for a Summoner-esque class! The class is Engineer, and they use items to "build" summons specific to their class. The strength of the summon would be based upon the character's class, the strength of the items used, the character's affinity with whichever summon it was (their experience "building" the model), and perhaps a Luck modifier here and there. It'd be neat if you could build a machine - or summon, if you must - and then, even though it's already "built," you could continue to add items to it in different ways. Items would become damaged as the summon took damage, and if the summon was completely killed, there's a risk of losing some of the items involved in creating the machine, but there'd be no MP involved, the summons would be much more dynamic than those called by Summoners, and they'd potentially be much stronger.