Yusi is one of the main characters on Qumi-Qumi. She is a Yumi-Qumi. Yusi is a representative of the Yumi-Qumi tribe. She is a hippie-girl coming from a wealthy family who is bored with chasing success. However, Yusi is used to comfort and sometimes acts as a spoiled and fickle girl. Yusi loves high-tech gadgets and is always carrying her portable device which can transform into anything from a phone to a scooter. Yusi can fix any complicated gadget in no time. She is very cheerful and never feels depressed. Yusi is sensitive and sentimental. She loves animals; however, there's almost none left on her island. Being sober-minded, Yusi counterbalances energetic Juga and phlegmatic Shumadan. She cannot understand which of the guys she loves more and behaves as a coquette nourishing their rivalry.