As usual for a World Noble and God's Knight, Shamrock is very loyal to the World Government and tends to think little of those who do not share Celestial Dragon blood, considering them commoners. He's patient and calculating, preferring to first solve problems with dialogue before then cruelty and gruesome tactics. He's ruthless against those who defy him and the World Nobles. Even family members are not spared from his prejudice if they don't adhere to Celestial Dragon ideals.