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This is a tough question, so many different options.
For the magic defense and healing you could go with a bishop, will get all in one. And with a party of 4 rather than 6 you get more XP so will level up faster.
For a damage giver you have a wide choice, fighter, or lord, (lord for the healing regeneration, fighter for berserk) or later on a Rogue will cause big damage and has lock picks and pick pocket. I like Samurai’s and monks but it takes a while to turn them into big damage givers.
So how about
Lord – poss a Dragon(sp) or some other race – Healing, Damage, with a good bow or X-bow should be good at range
Rogue – Hobbit – locks, pockets and stealth plus damage, give bloodlust and thieves dagger, that will be good at the start.
Bishop – Choice of races, poss human. Magic bluffs, healing, range damage with spells, plus can un-curse so can remove bloodlust from rogue if needed.
1 left…
Maybe a bard but you used one, a gadgeteer, good at range but need to carry lots of ammo…or a Samurai, that way your bis can do the psi and alc realms with lord and sam doing divine and wiz. The lightening strike of the Sam is useful to! As for a race…I’m currently using a Dracon Sam, he’s quite good.

Hope this helps