Active fifth character

[FFVIFan]

Suppose the guest in your party, like Sarah and Desch, actively participated in combat. What kind of equipment, magic and skills would each use? Would any of them be exactly like certain classes or would some be like hybrids that the four heroes are unable to emulate?

I would to think that the princess in Djin Cave would help by healing. Eitherwise she wouldn't be hitablw making her immortal. But still, he healig abilities are slim.