How about a warrior that specs into warfare,hydro and geo? I usually only invest the necessary amount for certain abilities, but I sometimes wonser if having a party that can setup elemental combos is practical.
My party is usually structured like
this (points provided by gear included):
Areothurge,hydro,scoundrel, duelwield, ( 2-3 points in necro if possible)
Warfare,geo,hydro,single handed, ( at least one point in summoning)
Pyro,Necro,Summoning,two handed ( enough hydro points for Bloodrain)
I also try to invest in defense catagories like leadership ect. Though I must admit that I'm prone to the Best defense is a good Offense and Weakening oponents form of strategy.