1 wizard, 3 fighters.

Dual light weapons Fighter and Heavy weapon Paladin (for Sacred magic) frontliners, backline is dual-dagger Ranger (for Nature magic) and Monk (for Arcane).

Playing for the first time right now with a diverse party so I can explore as much content as possible.

two monk in front with heavy weapon
a priest and a ranger behind

im running, 2 Paladins, one with light weapons and fire Magic, and one with heavy weapons with earth magic, for the Mass Shield and Heroism Buff, a Ranger for the dex buff and nature spells and ranged weapons, and wizard for all other magic stuff

My party is similar to blackbeard's, above.

Front:
Repton - Lizardman Fighter, Light Weapons 5, Critical 5, Armor 5
Quirrel - Insectoid Paladin, Constitution 4, Heavy Weapons 5, Armor 5, Fire 4
Back:
Cluny - Ratling Ranger, Alchemy 5, Perception 5, Missile Weapons 5, Air 3
Stephanie - Human Monk, Concentration 5, Fire 5, Air 5, Water 5

(all of them have a couple of odd points elsewhere but those are the main ones)

The only downside is that (so far) I have had to do without some useful Earth spells, but I have enough red gems that I could put more points into Earth if I were sure that was the best use for them....

4 Ratlings all with Endure and Treasure Hunter.

3 Monks.
- Light weapons nimble lockpicker.
- Firearms alchemist constitution miner.
- Concentration / Fire / Air arcane mage.

1 Ranger for nature magic. [conc 3] [earth/air/water 5]

I actually went for a solo run as a ratling monk, ended up using earth magic poison spells, firearms and light weapons, with a sprinkle of skillpoints from books to reach everything I could. currently at level 15 with 30+ in all stats. my food stores are enormous understandably, so I sleep a lot to recover health.

Yeah with the way buff consumables only work on 1 person I imagine that going solo would quickly result in a nearly immortal monk.