Haku, also known as Gavin in some versions, is a main character in the Mr Love: Queen's Choice anime. He is twenty-four years old with a birthday on July 29, making his zodiac sign Leo. Haku stands 181 centimeters tall and has brown hair that is cut to ear-length, along with yellow eyes. His appearance often includes elements like a hoodie, tie, earrings, and a uniform.

Professionally, Haku works as a police captain in Loveland City, but this position serves as a cover for his true role as an Evol Agent. In this capacity, he specializes in handling crimes that are related to Evolvers, individuals who possess special abilities known as Evol. His own unique Evol is the power of Wind Control.

Haku shares a past with the heroine, having attended the same high school as her. Initially, he comes across as stoic and unapproachable, a demeanor that hides a deep-seated personal moral code. Despite his tough exterior, his motivations are rooted in protecting others and adhering to his own principles of justice. His role in the story is tied to investigating a larger conspiracy connected to the heroine's father and the mysterious nature of Evol itself.

Regarding his character development and key relationships, the information provided does not offer specific details about how he changes throughout the narrative or thorough explorations of his bonds with other characters beyond the heroine. Likewise, no extensive information is available on his notable abilities other than the classification of his Evol as wind control.