Theo is Roland's spymaster. He investigates any information that might be pertinent to Roland and then relays it to the prince.
Theo is an intelligent man, using all the means at his disposal in order to gather information.
By sending the information that Roland is recruiting witches, the prince earned important allies, the sleeping island witches, along with Paper, Lucia and many others. The only negative news is that the Church caught up on this piece of information, and although they planned to scout and attack Roland and his town, but they were stopped by both Ashes and Garcia respectively.
Theo is skilled in combat, but is best in espionage.
Silver knife: His personal self-defense weapon.
Revolver: it was given to him by Roland when he was send to the King City together refugees.
Theo is completely loyal to Roland.
Theo taught Hill everything the latter knows about information gathering.