"Ryusuke is a prominent character in the Japanese manga ""Marriage Contract With My Sadistic CEO."" He plays a pivotal role in the series as the CEO of a major corporation, and his personality is a mix of sadistic and intimidating.

Ryusuke is introduced as a successful businessman who is feared and respected by his colleagues and subordinates alike. He is a powerful figure, with a commanding presence and a sharp mind. His name may not be shown as frequently as other characters, but his actions and speech are essential to the story.

Despite his intimidating demeanor, Ryusuke is a complex character with a range of emotions. He is shown to have a softer side to his personality, especially when it comes to his love interest, Yui. As the series progresses, it becomes apparent that Ryusuke is deeply in love with her and will stop at nothing to protect her.

Furthermore, it is revealed that Ryusuke's sadistic tendencies stem from a traumatic event in his past. This backstory adds depth to his character and makes him more relatable, despite his intimidating exterior.

Ryusuke's character arc is also of utmost significance to the plot. He undergoes significant transformations throughout the story, including personal growth and emotional development. These changes affect the storyline as a whole, which makes Ryusuke one of the most important characters in the manga.

Overall, Ryusuke's character is a complex and dynamic figure who adds depth and tension to the story. His name may not appear as often as other characters, but his presence is indispensable, and his actions are significant to the plot."