Marissa Arenas is a character in DEXTER.
She is the sister of Rafael Arenas and daughter of Eva Arenas. Following her brother's murder, she comforts her mother and looks at Dexter Morgan with the same kind of eyes that he had back when his mother was killed. Her life takes a drastic turn for the worse when her mother is murdered as well after Dexter fails to kill Chino due to his mental state and Chino's men come after her mother shortly thereafter. She is taken away the same way Dexter was and was presumably raised in the foster system.