Good advice by posters in this thread. Though in my experience he's only as strong as you make him. In a balanced situation the stronger real player should be victorious.

Spoiler.
The game stops around level 50-60. Unless you're fighting monsters at level 99. Without math skill and tweaks, draw out, blade grasp, and magic defend up work well for me.

Mustadio can't equip perfume and needs to be a knight to equip Excalibur. He was only good for standing back and calculating.