Ako Udagawa is a fictional character from the multimedia franchise BanG Dream! She is the energetic and passionate drummer of the band Roselia. Known for her chuunibyou (delusional grandeur) personality, Ako often refers to herself as a 'Darkness Empress' and brings a unique charm and comedic flair to the group. Despite her dramatic tendencies, Ako is dedicated to her friends and her music, and plays a vital role in supporting and energizing the members of Roselia.