Kurokawa Ellen

Ellen is one of the official characters of the Pretty Cure franchise and one of the main Cures of Suite Pretty Cure. Her alter ego is Cure Beat (キュアビート) and her mascot is Lary, a blue Fairy Tone to transform with.

Canon
Before being brainwashed Siren was a kind cat. She always cared for Hummy dispite her being naivee to most things. However she could get very envious of other people's achievements, such as when Aphrodite chose Hummy over her to sing the Melody of Happiness. After being hired by Mephisto she was cold, calculating, un-sympethetic and unwilling to open up to people. But there was still good in her, when Hummy managed to convince her that she was blindly following Mephisto and was being used. Her earphones broke and became Cure Beat.

As Ellen, she underwent a dramatic personality change. She has become more upbeat and cheerful. She was also shown to be much kinder, but with this newfound kindness also came a streak of naivety, such as being easily offended or being prone to childish fears. After a chat with Hibiki and Kanade she became exicted at the prospect of starting school. So much so, she spent the whole night practicing her introductory speech, showing just how passionate and commited she was to being accepted as a friend.

Fanon Description by Caramelangel714
Ellen's symbol is a violet heart-shaped electric guitar.

In the Mega Man crossover, her special alter ego is Time Beat (タイムビート), combining with Time Man's power.

Time Beat
"The celtic tune of a secret clock, Time Beat!" 秘密のクロックのケルト·チューン、タイムビート！ "Himitsu no kurokku no keruto chuun, Taimubiito!"