Towa Akagi

She is the daughter of Dyspear who wears a black mask and carries a violin. She is also known as the Princess of Despair. She appears to have fire powers and possesses a black Dress-Up Key, which she inserts into one of the Three Musketeers' locks to increase the power of the Zetsuborgs they summon.

(Source: Pretty Cure Wikia, Wikipedia)