Utukku are extremely dim-witted. Utukku are favored by Assyrian Magicians. Bartimaeus killed many utukku single-handed at the battle of Quadesh simply by throwing a stone behind them and running them through with gusto when they turn around. The Utukku that survived the battle remember Bartimaeus's name with hatred as shown when Bartimaeus is being guarded by two Utukku while imprisoned in the Tower of London, trapped in a Mournful Orb that gradually shrinks.
- In myths, utukku could be good or evil.