Herba is one of the Four Lords of Gaudium with the appearance of a humanoid plant woman. She is considered Earl Tyrant's favorite and usually sits besides him on his throne. She carries an umbrella and is usually accompanied by her pet Hug-Hug. She has a habit of adding the word, "baby" behind a person's name if she likes them. She draws her power from plants. In the end of the anime, Herba falls into Chaos, but in FFU:After, it's revealed that she actually survived to become Princess Herba. She assumes her role as Chaos' agent by using her plants to feed Chaos until the Hayakawa twins Yu and Ai assume their chosen role as Chaos Rulers.
Furthermore, she was responsible for transforming Dolk, Lisa Pacifist's lover and part of the C2 Organization which she works for, into Soljashy, the first Lord of Gaudium under her. Soljashy is part of Herba's plot to feed Chaos. She retreated into Wonderland after manipulating Lisa to open the portal to that world.