Kei's personality is rather cheerful and playful despite his serious appearance and his position as the oldest in VΔLZ. He also has a mischievous side that has most often comes out when interacting with Haru. He enjoys singing and often thinks of interesting/unique things to do, which has lead to some diverse content on his channel. With his group mates, he is playful and mischievous, however he tends to be bullied or teased by his NIJISANJI senpai.
In 2022, with the sudden increase of numbers in his collaborations with international NIJISANJI Livers, he started learning English; he tried shadowing at first, but he later started to have a chatting collabs with other English-speaking Livers to make his English even more better. In the meantime he befriended Livers like Selen Tatsuki, Alban Knox, Yugo Asuma, and Layla Alstroemeria.
