"Kyosuke is one of the main characters in the Japanese manga ""Substitute Bride"". He is a handsome and charming young man with piercing blue eyes and jet black hair, who comes from a wealthy and influential family. Kyosuke is initially portrayed as a cold and distant character, who avoids getting involved with others and maintains a serious demeanor at all times.

Kyosuke's personality transforms, however, when he is presented with the opportunity to inherit his family's company. He becomes more assertive and confident, and is willing to take on any challenge in order to prove himself worthy. Kyosuke's determination and resilience are his defining traits, and he is willing to put his own needs aside in order to help those around him.

One of the reasons for Kyosuke's cold and distant demeanor is that he carries a deep-seated sense of guilt over a family tragedy that occurred when he was younger. This tragedy has left him scarred and emotionally closed off, and it takes time for him to open up and trust others again.

Despite his serious demeanor, Kyosuke has a kind and gentle heart, and he is willing to do whatever it takes to protect those he loves. He is particularly devoted to the heroine of the story, Mina, and will stop at nothing to ensure her safety and happiness.

Kyosuke is also a skilled businessman, with a natural talent for leadership and strategy. He is highly respected in the business world, and his family's company is one of the most successful in the country.

Overall, Kyosuke is a complex and multifaceted character, with a compelling backstory and a strong sense of purpose. His journey from a distant and guarded young man to a determined and loving protector is one of the central arcs of the story, and serves as a reminder that even the most reserved and closed-off individuals can find love, happiness, and redemption."