Despite being a powerful Psychic, Saiai is one of the most mellowed-out characters in ITEM; she isn't a screw-up like Frenda, nor is she as frightful as her leader, Mugino. She enjoys B movies and likes to tease others, Shiage in particular because of his reaction to anything sexually suggestive.
She also likes to add "super" to her remarks.
Saiai was previously part of the "Dark May Project"- an experiment that used subjects that were most likely Child Errors in an effort to replicate Accelerator's powers. It is unknown whether or not Saiai herself is a Child Error.