Irisviel is quite peculiar compared to other Einzbern homunculi. She was the first to have received the same treatment as a human and the first to have human emotions. Furthermore, she has interacted with humans for nine years and developed such colorful and eccentric mental activity. She was originally a blank slate that did not possesses any human qualities. Her physical and mental capabilities surpasses those of a human, so they did not fail her during her exceptional growth, allowing her to gain self-awareness and emotions.