As a Magical Girl, Grim Heart has short, curly, dirty red hair decorated with red hearts. She wears a crown with heart designs and a pink flamingo decoration in the center.
Her dress is crimson red and decorated with hearts and flowers.
To ignore rude opponents
As long as the opponents are not "permitted", she does not accept any interference from them. Combat, magic, conversation, and any other communication can only be done unilaterally from Grim Heart. Whether a person is considered rude or not is up to Grim Heart's discretion, though usually, all people besides her are rude people. The magic even works in a person's own world, such as Keek's Cyber World.