"Hakuo is a prominent character in the manga ""How to Serve a Devil Prince"". He is a demon prince hailing from the underworld and is one of the most powerful beings in the series. Hakuo's character is shrouded in mystery and he seldom reveals information about himself.

Hakuo is introduced in the manga as a serious and stoic prince, who is distant from his subordinates and has a no-nonsense attitude towards his duties. He is extremely strong and is feared by many in the underworld. Hakuo's hairstyle is unique, as he has a messy, unkempt appearance with long white hair that extends past his shoulders. He is often seen wearing black clothing, which only adds to his sinister aura.

Despite his fearsome reputation, Hakuo is shown to have a kind heart, especially towards the protagonist Kuro, whom he develops a close relationship with. He is always willing to offer advice and guidance to Kuro, and even risks his power and authority to help him.

However, Hakuo's kindness is not without limits. He is fiercely protective of his subordinates and those close to him, and will not hesitate to use his power to punish those who betray him or his friends. Hakuo's backstory is never fully revealed, but it is hinted that he has faced a great deal of tragedy and hardship during his time leading the underworld.

In addition to his physical strength, Hakuo possesses powerful magical abilities, which he uses to great effect in battles and when dealing with his enemies. He is also extremely intelligent and is often able to outsmart his opponents through his wit and strategic planning.

Overall, Hakuo is a complex and fascinating character who adds depth to the ""How to Serve a Devil Prince"" manga. He is both feared and respected by his subordinates, and his relationship with Kuro is one of the highlights of the series."