"Riku Mamiya is a character in the Japanese manga series ""Check In to My Heart"". He is a tall, lean and handsome young man with short, spiky black hair and piercing blue eyes. Riku is a popular model and actor, adored by his fans for his striking good looks and charming personality.

Riku comes from a wealthy family and has had a privileged upbringing. He is accustomed to getting what he wants and is used to being the center of attention. However, beneath his confident exterior, Riku often feels lonely and misunderstood.

Riku is a talented artist and enjoys sketching and painting in his free time. He is also an accomplished musician, playing the guitar and singing. Despite his busy schedule, Riku always finds time for his passions.

In the manga, Riku crosses paths with the main character, a shy and introverted girl named Hikari. At first, Riku is skeptical of her and dismisses her as just another fan. However, as he gets to know Hikari better, he discovers a kindred spirit in her and begins to open up to her.

As Riku and Hikari grow closer, their relationship becomes increasingly complicated. Riku is torn between his growing feelings for Hikari and his fear of hurting her by revealing his true self. He struggles to find a balance between his public persona and his private life.

Despite his flaws, Riku is ultimately a good-hearted and caring person. He is fiercely loyal to those he cares about and is willing to do whatever it takes to make them happy. In the end, Riku's journey of self-discovery and growth is a central theme of the manga, and readers are left rooting for him to find happiness and fulfillment."