Ok,I have 3 party members that I am only using.The thing with the Junctioning system that I was wondering was there anything in particular that I should junction to help me protect myself a little better?

And as for my 3 party members they all have 5,000 HP.Of cours I know about that second form that takes 8,000 hp,but I was thinking I could use Hero on my party.I have 6 of them so I dont know if that plan would work entirely.

Is there anything that I can find that would junction my party to a really high HP?Currently I am using "Regen" I think.