The Heir of Hope is one who is said to inherit their faith or godly powers, and also has been known to bend their faith into a weapon. While Knights of Hope tend to be more of paladins, Heirs tend to be Clerics, fighting with their faith instead of for it.
Heirs tend to be somewhat silly at first, and then begin to grow more responsible as their powers grow. This responsibility can prove to be very lethal with Hope players sound faith.