Saiko is introduced as having a lazy demeanor. She dislikes having to work and prefers having a peaceful, happy-go-lucky and carefree life by playing video games and eating junk food excessively. She can display a childish nature, such as when she sometimes talks in third-person. She also doesn't really try to lose weight but is rather embarrassed of it and humorously covers it with her finger during her introduction. She often oversleeps, which earns her the absence from most missions. Her absence can also be justified by a lack of motivation; it was her mother's decision for Saiko to become an investigator. This can also lead to Saiko being somewhat insecure about her abilities. Throughout the series, we can see that Saiko is in fact very talented in kagune manipulation.