"Hayato Saito is a prominent character in the Japanese manga series ""Past Life Returner"". He is a tall and muscular young man with dark, spiky hair and intense brown eyes. His personality can be described as confident, determined, and fiercely independent.

Hayato is an accomplished martial artist and skilled fighter, having trained extensively in various forms of hand-to-hand combat. He takes great pride in his physical prowess, and often relies on his strength and agility to overcome his opponents.

Despite his tough exterior, Hayato also has a softer side to him. He is fiercely loyal to his friends and loved ones, and is not afraid to put himself in harm's way to protect them. He also has a keen sense of justice, and is quick to intervene when he sees someone being mistreated or wronged.

Hayato's past is shrouded in mystery, and he rarely speaks about his life before becoming a ""returner"" - a person who can traverse between parallel worlds. However, it is evident that he has experienced significant trauma in his past, which has fueled his determination to become stronger and seek revenge against those who have wronged him.

As the story progresses, we see Hayato become increasingly involved in the larger conflicts between the various factions of returners. He often finds himself at odds with other characters, particularly those who would seek to use their powers for their own selfish gain.

Overall, Hayato Saito is a complex and compelling character with a rich backstory and strong motivations. He is a crucial part of the ""Past Life Returner"" series and a fan favorite among readers."