Here is her character description, via IzanagiGames:
Hanaka (voiced by Miku Ito) is an underground pop star imprisoned for a particularly sensational incident. She’s sweet and genuine, and cares about her fans. She knew her teammate Oka before taking part in the Yurukill Games. The other participants often don’t know what to make of the pair’s unique, energetic interactions.
Previous trailers introduced Mass Murders team members Sengoku Shunju and Rina Azami; Binko; Death Dealing Duo team members Futa Yamada, Raita Yamada, and Kagura Kagutsuchi; and Crafty Killers team members Gentoku Omuro and Izane Akegarasu.
Watch the trailer below.