Prince Hiiro is a kind and nice prince, although he is sometimes very playful, he knows his duties and responsibilities and takes them seriously. A gentle and cute prince he is, he can sometimes be really reserved and silent. He is never afraid to speak his mind and is a very straightforward person. Prince Hiiro is also very smart, he excels in mathematics and history and is willing to help anyone in need. But sometimes behind the covers, he can also be pretty playful and perverted.