Liu is one of the main characters in Running Man. He is the cartoon counterpart of Yoo Jae Seok in live-action series Running Man. He is voice by Kim Seo Young in Korea, Rachel Slotky in English.
Liu is a green grasshoper with large purple irises and wears a pair of round glasses that curved to fit his face. He wears a pair of inflated, yellow pants and a red vest over his shirt.
Liu, as like anyone from the Bug Tribe, is exceptionally intelligent and seems to have a hand at inventing. He has a kind heart and fierce determination, but could be aloof to others' plans to take advantage of his kindness such as when Lonky and Popo had tried to get the others on his side so that they could join Kuga's team. They attempted this by trying to put Liu on a high pedestal, which backfired greatly.
Liu can also be easily flustered and sheepish due to his fragile nature.