Trish
Trish, who bears a great resemblance to Dante’s deceased mother Eva, is a creation of Mundus. As a result of her demonic nature she possesses several supernatural abilities, like superhuman strength and lightning powers. In the first game, she hires Dante to help stop Mundus' plan to conquer the human world by opening a gate to the demon world on Mallet Island.
Later in the game Dante learns that she is a servant of Mundus, and that her resemblance to Eva was part of a plan to lure Dante to the island so that Mundus' servants can kill him. However, she develops feelings for Dante and helps him defeat Mundus.
In the game's epilogue, she and Dante are shown working together as partners out of the renamed "Devil Never Cry" office. In the anime, she has since gone solo but sometimes reappears to work with Dante, who has given her an open invitation to come back at any time.