... Or, their abilities don't match their weapons.What's needed for a character/monster to fight properly, is:1. At least one fighting style (these require appropriate weapons - it takes a dagger to use dagger styles),2. A weapon (either in the hand or in the inventory, characters automatically equip carried weapons),3. Proper behaviour profile (especially Behaviour set to anything but Coward).4. Optional for testing, but ultimately required - fighting animations (not all models have all animations - you may have to hack some .mdb files, if you really need to let a child wield a 2-handed sword),If anything of these fails, the game's AI system forces the character to use IGNORE_ME and IGNORE_ALL profiles, essentially excluding the character from combat.