Trish, a humanoid demon who resembles Dante's dead mother, was created by the demon emperor Mundus. She has enhanced strength and agility, accelerated healing and the ability to use lightning.
Trish is introduced in Devil May Cry, where 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 actually Mundus' servant and her resemblance to Eva is part of a plan to lure Dante to the island so Mundus' servants can kill him. However, she is attracted to Dante and helps him defeat Mundus. In the game's epilogue, she and Dante are shown working in the renamed "Devil Never Cry" office.
Source: Wikipedia, "[en.wikipedia.org/wiki/Characters_of_Devil_May_Cry%23Trish Characters of Devil May Cry]", available under the CC-BY-SA License.