Hanabatake Chaika (花畑チャイカ) is a male Japanese Virtual YouTuber and a member of NIJISANJI. Previously, he was a first-generation member of NIJISANJI SEEDs along with Dola, Umiyashano Kami, Nakao Azuma, Izumo Kasumi, Todoroki Kyoko, Sister Claire, Yashiro Kizuku, Azuchi Momo, Suzuki Masaru, Ryushen, Uzuki Kou, and Hassaku Yuzu.

His previous name is "Chaika Brine", a rather dense 'onee'.
He previously owned a bar, as a 'Mama', in a country in another world.
Three years ago, he was transported to the present day and is now the owner of a certain coffee shop. He has a keen sense of intuition and is very clever.