Rogue and necro worked well for me. Rogue dis high ST and killed bosses. While minions took aggro and reduced the mechanics needed for the Rogue avoid.

My friend and I have been doing well with a Druid using a werebear build and a sorcerer.

I can see something filling that paladin/ crusader void.

I wouldn't say they're combined at all. The distinguishing feature between wizards and sorcerers is that most of the wizard spell list is arcane magic, whereas the sorcerer has no arcane magic and focuses solely on fire/ice/lightning elemental spells.