Thanks for the replies guys. I've decided to go with:
- 1 Lone wolf battlemage --> with Zombie & Demon talents
This will be a close up mage with touch spells for cheap AP cost, explode and self-immolation, and it's using the warrior skills primarily for Rage (+50% spell damage) and melee power stance (+20% spell damage).
Hybrid chars need the extra talent points from Lone wolf, and the higher hitpoints allow it to soak poison and fire damage for a longer time to heal.
- In the back will be 2 identical mages with Witchcraft and geomancy to throw poison at the main tank to heal him. They'll also both have the Stench talent to make the AoE tank more effective.
I've taken Jahan at the moment. Slightly modified him to get rid of the unwanted level up choices and make him the same as the main character mage. (This also meant I removed 1 attribute point from him which he had more for some reason)
So far it's going great in Tactician mode. I used to always play with 2 lone wolves, but having 1 strong main char and 2 support chars works wonders too.