"Oliver is a pivotal character in the Japanese manga series, ""The Devil’s Daughter."" He is a 17-year-old boy who works at a local cafe with the protagonist, Emilia. Oliver is a charming, kind-hearted person who often finds himself getting involved in Emilia's supernatural shenanigans.

Throughout the series, Oliver serves as Emilia's confidante and friend. He is often the one who provides emotional support to her when she's going through a tough time. Oliver has a gentle personality, but he can also be quite brave when it comes down to it.

Oliver is described as having a tall and slender build, with short, messy hair that falls around his face. He has piercing green eyes that are often likened to emeralds. He is often seen wearing his work uniform at the cafe, which consists of a blue shirt and apron.

In terms of personality, Oliver is a bit of a romantic, and he has a tendency to get flustered around Emilia. He is very loyal to his friends and would do anything to help them out. However, he does have a stubborn streak and can be quite headstrong when it comes to his own beliefs.

Overall, Oliver is an endearing character who adds a lot to the storyline of ""The Devil’s Daughter."" He is well-liked by readers for his kindness, bravery, and loyalty. Oliver's character is a perfect example of how even supporting characters can play a vital role in a manga series."