He is a character in Shugo Chara Kirakira. He first appeared in season 1 ep 5. He leave Eternal Dreamless in episodes 53 of season 1. He's 15 years old but turn 16 years old at some point in season 2 and turn 17 years old at some point in season 3.
He has spiky brown hair, same skin tone as Kairi and orange eye.
He's cocky and ambitious.
his and his older sister, Megu parents were killed in an accident, leaving him and Megu alone, and to live with his aunt along with Megu. He had a hard time to overcome it and ever since he was young his sister seemed like the perfect child As she had good grades, a great reputation and everyone seemed to like her, due to this Masaru has always been and still feels pushed to the side. He feels that he has always been and still is compared to his sister even though they are two different people. Then he went to study abroad where he meet Kiwako.
Before his final battle with the Observers his family came to see him after he had not any contact with them for a long which they called out to him after a battle with the Observers.
During the final battle with the Observers he reveal his past which caused. His family talk about about there feelings and the Observers were able to reasoned him causing his Dark Watch to break and him leaving Eternal Dreamless.
He later came back to take the Observers back to the Eternal Dreamless building where get to meet the true leader of Eternal Dreamless and manage to reason with Kiwako with everyone else there in the final battle.