You could have a go at theorycrafting done here,because you have one section which can be good when the game releases.

http://larian.com/forums/ubbthreads.php?ubb=showflat&Number=605277#Post605277

What I would do for a 4 man squad

Red Prince with Fighter preset - get points into Hydro, Poly and Aero (this exact order).Also I would put a staff on this guy
Ifan with Knight preset - get points into Scoundrel for Adrenaline Rush, Walk in Shadow and Cloak and Dagger - improvise from here
Sebile with Huntsman preset - get points into huntsman,geo and pyro
Loshe with Inquisitor preset - give her a one handed weapon and shield and the oportunist talent and she will be your best tank

Now then if the starting character is Ifan, ditch Rage for Adrenaline Rush and the +1 in two handed for a point in Scoundrel and don't forget to change the Oportunist talent with the Executioner one, but if your starting character is the Red Prince ditch warfare for poly (bull rush,so you can charge with wand and shield) and when you level up you can ditch aero as I previously recomended and go pyro. If Loshe is your starting character, ditch telekinesis for leadership and Executioner for Oportunist,then get Comeback Kid at lvl 4.