Hmmm... not.... really.. I'm quite boring with how i think about their battle stuff...

Zansei is a combo of DRG, BLM AND SMN and essentially becomes a fucked up version of Bahamut and Nidhogg in his Shard , he uses tattoos to do his summons and spells (which is how Amelia gets that knowledge in the future since she.... inherited his Essence lmao....)

Faust is like a combo pld/drk but doesn't like using a shield....

Noel i think is also similar to kamui where he is now a voidsent but he doesn't use a sycthe or rod for his black Mage stuff.... just uses claws and teeth when he's 'enshrouded'