Kanon Usui

Kanon is the daughter of Kenta and Karin, and also the reincarnation of Sophia. She has a father-complex. Both Anju and the Akuma twins wish her to live a happy life, as she is Anju's niece and the twins' reincarnated younger sister (though the twins haven't directly met her, as she was just conceived by the time they met with Sophia within Kanon's soul).