Mafumafu is a Japanese singer-songwriter. In addition to his solo work, he is one half of the music duo After the Rain with fellow utaite singer Soraru. His broad vocal range, spanning over five octaves, allows him to sing in an extremely high register, and in addition to his original music, he often covers Vocaloid songs in their original key. He represents himself with a white-haired, red-eyed character with a barcode on his left cheek. As of 2025, his YouTube channel has over 3.6 million subscribers, and his videos have amassed over 2.25 billion views.