Izumi Kashii is the drummer for the idol group JAXX/JAXX. Standing 185 cm tall and weighing 72 kg, his physical stature makes him both the tallest and oldest member. His birthday is May 5, his blood type is O, and his zodiac sign is Taurus. Before joining JAXX/JAXX, he belonged to the idol group Popping Zoo under Groovy Productions. Alongside four other members from Popping Zoo, he transitioned to JAXX/JAXX after being scouted by sMiLea Production, the agency founded by the retired duo AneLa. This agency simultaneously formed other units like Protostar and Legit. Gakuto Haruka was not part of Popping Zoo and joined JAXX/JAXX later. Kashii possesses a calm and gentle personality. Despite his seniority in age and presence within the group, he is often influenced or directed by other members. He dislikes heights and insects. His interests include attending idol live performances and eating ramen. He originates from Hokkaido. The kanji in his name carry specific meanings: "Izumi" combines "one" (一) and "clear/pure" (澄), while "Kashii" derives from "fragrance" (香) and "oak/mallet" (椎).