I play with an all women crew. Choosed elenor in char creation and next i use then loren, karen, myrth, dora and chambara. Yeah, i have 2 mages in the team. Works quite well together.
Loren, Elenor and Karen are all in the front row, rest is in the back. Choosed warrior for elenor, but pumping points into will. I only focus on the hero skills, so elenor is the supporting char. I let her have the sword and crossbow, which works well.
Loren is the tank and can deal heavy blows. I focus here on the special battlemaster (or something like that) tree, unlocking the 2 weapons feat and that one that deals extra damage. Pumping alot of points into strenght, but i use will as well, for those special attacks.
Karen is not entirely a tank, more sortkind of battlemage, maybe paladin. But has indeed some nifty tricks on her sleeve. I let her keep a spear, just to use those special attacks. Also use focus.
Dora is the classical archer and i just also use her in that role. Rei use indeed also a bow, but Dora is better in it. Rei is more an assassin. Pinned shot and all those other things from the ranger tree. From the attributes 2 things are especially usefull for an archer: speed and critical hit. A high critical do wonders with dora. Well, Myrth is the druid class and act just as that. Comes with usefull AoE spells, such as that insect swarm and vines. I put most points into will and also some in skill, for the defense. Since a druid is a mage class no need for strenght. Then as last Chambara. Necromancer class, which means an offensive mage. I use her for that as well. Not completely AoE, but those spells she has are very powerfull and make short work of those with high health. I find swap rot (think this is the name) especially usefull and that one that causes burning. Necromancers rule.
Equipment is also important. Good equipment is the key to success. I pay attention to equipment which fits to the character and what kind of attributes it has. For armor i look if it got any resistances (to poison, burn, etc) as well as certain modifiers and for weapons i look for extra effects, especially with archers and fighters.