Toyama Kasumi is the main protagonist of the BanG Dream! franchise. She is a third-year student at Hanasakigawa Girls' High School and the leader, vocalist, rhythm guitarist, and songwriter for Poppin'Party. Outside of the band, she is friends with the rest of the vocalists. She also works part-time at RiNG together with Saaya. Kasumi has purple eyes and brown hair worn loose with segments pulled up into star-shaped buns. Her short bangs are framed by longer forelocks held by red star-shaped clips. In her initial casual wear, she wears a long, baby blue button-up T-shirt dress accompanied by a yellow flannel tied along her waist. She also pairs it with a silver star necklace and a black watch. During winter, she wears a red collared shirt, a yellow sweater which has white stars on it, a black miniskirt, and a pair of tights. During summer, she wears a polka-dot white T-shirt with transparent sleeves and a blue skirtall. The outfit is completed with a necklace that has three stars on it. Cheerful and high-spirited, Kasumi is a playful, active, and generally positive girl that always finds something to be excited or passionate about. She easily makes friends and gets along with everyone, regardless of their personality. She, alongside with Tomoe, are capable of sharing the same enthusiastic mental wavelength with Kokoro. She is also the type to believe in (or fall for) the strangest explanations. Kasumi can be forgetful at times, tending to do important things at the last moment, though unintentionally so. She loves to tease Arisa, but given her kind personality, it's hard to tell if she's deliberately trying to provoke her or if she's oblivious. At times she can also behave melodramatically.