The Power of Royalty is a prominent driving force of the story in Hayate the Combat Butler. It is a mysterious power which is said to be: The power to make someone wealthy enough for their entire life. There are little clues about this power, but its existence is real. As implied by Athena, the power of royalty is always residing inside her castle. However, no person can successfully get that power unless they have the key to the castle which is a King's Jewel. The power is also guarded by her castle's traps and herself, but Athena never mentioned the power to anybody else except to a few people including Mikado Sanzenin and Hayate's Brother. There are many rich people in the world who are aiming to get it for themselves, including Mikado and Midas. Whether they are aiming to use it for good or for evil is unknown. Ancient people have sealed the power to maintain the balance of the world's economy and peace. It is said only a person with extensive knowledge, having strength and courage, and also strong mentality is capable of getting the power. A person who wields the Power of Royalty is implied to be gifted with the ability to always be successful and wealthy. Becoming rich very quickly and easily, being fated to a life filled with riches, continuously attracting wealth, win the support of others all the time, and get what they want. It will make the user incredibly successful and wealthy to the point where troubles will be unknown.

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