Rosa is corporate, ruthless, ambitious owner of the most popular company for monster hunting in the world. She used to be one of the best monster hunters back in the days and is a well-known old adversary to Mr. Butterfly.

Her successful monster hunting business turned her into a reality TV star with her own show and crowds of roaring fans.

She used every dirty trick in the book to screw over her competition and as a result now Rosa’s corporation is on top. It’s even rumoured that she set up a trap and paid off the Universal IRS to revoke Mr. Butterfly’s license. Not that he was ever a significant threat to her. Simply out of spite. And to send a message.

Since Rosa never approved of her parents’ ways, she raised her daughter Valkyria the only way she knew - as a monster killing machine.