Reference

Demon Kakka, a Japanese musician known for his striking appearance and the lead vocalist of the heavy metal band Seikima-II, was initially asked not to enter the Ryōgoku Kokugikan in costume to avoid causing a distraction. This request was made due to the traditional and formal nature of sumo wrestling events held at the venue. However, he complied with the request and later, in 2005, was asked by the Japan Sumo Association to formulate his dream banzuke, indicating a change in attitude towards his participation in sumo-related events. Images of Demon Kakka, such as those from Wikipedia and Tachiai, show his distinctive costume and presence, which might have been considered a potential distraction in the context of sumo wrestling's ceremonial proceedings. Source: Wikipedia