"Hanna Yoo is a major character in the Japanese manga series ""Magician"" written by KIM Sarae. Hanna is a powerful magician with a kind heart but a fierce determination to protect those she loves.

Hanna first appears in the manga as a young girl who is saved by a powerful magician named Myung-Ee. She quickly develops a strong bond with Myung-Ee and becomes his apprentice. Under Myung-Ee's tutelage, Hanna hones her magical abilities and becomes a formidable magician in her own right.

As the series progresses, Hanna becomes a central figure in the ongoing conflict between the magical world and the human world. She is fiercely loyal to Myung-Ee and will stop at nothing to protect him, even if it means putting her own life in danger. Hanna is also deeply compassionate and is always willing to help those in need, even if they are not part of the magical world.

Despite her kind nature, Hanna is no pushover. She is a skilled fighter and is able to hold her own against much stronger opponents. She is also extremely intelligent and is able to think on her feet in the face of danger. Hanna's quick thinking and powerful magical abilities make her a valuable asset to Myung-Ee and his allies.

Throughout the series, Hanna's loyalty to Myung-Ee is tested time and again. She is forced to confront some of her own inner demons, including her fear of losing Myung-Ee and her anxiety about using her magic to harm others. Despite these challenges, Hanna remains a steadfast ally to Myung-Ee and is always willing to do whatever it takes to protect him and their friends.

Overall, Hanna Yoo is a complex and compelling character in ""Magician"". Her strength, intelligence, and compassion make her a fan-favorite among readers of the series. Her struggles with loyalty, fear, and self-doubt also make her a relatable and realistic character that readers can't help but root for."