Chelsea

Chelsea is a vampire from Twilight.

Abilities
Relationship Manipulation: Chelsea is gifted with the supernatural talent of influencing the emotional ties between people, either by weakening or strengthening them. Aro, one of the Volturi leaders, used her gift to keep Marcus loyal to the Volturi after Didyme's death. Due to the importance of her gift, Aro thinks of her as one of the high ranking members of the Volturi, along with Jane and Alec and uses her as a secret weapon to disband their enemies and binding wanted people to the coven.

Chelsea's main occupation is to distance the innocent emotionally from the guilty by severing the bonds that are shared. Also when a vampire Aro is interested in appears, she secures the ties of that vampire to the Volturi, prompting them to serve willingly. Eleazar suspects that Aro had been using he rpower to make the Volturi guard co-exist easier, as well as strengthening their willingness to obey the leaders.

However, her powers has a few limits; as stated by Eleazar, she cannot as easily influence the emotional ties of people that are stronger than friends or acquaintances, and in a normal case, even those who think of each other as family. She could not have changed the way Bella and Edward felt about each other, for example, or the ties between a true family, i.e. one that deeply cares for and loves the members within it. When she is not around those whose bonds are tied by her power, her influence will not fade immediately; rather, it wears off over a matter of time depending on how long a person has been exposed to her power before separating from her.

Also, though she can influence these ties, she probably doesn't have to the power to see them. This is suspected by Marcus's ability to read emotional bonds between people and the fact that Aro does not surround himself with second-best gifts. If she could see them in the first place, he would not have needed to keep Marcus in the coven. Her power is also the main reason Caius had no attempted to overthrow Aro.

Her power is also mental, as proven when she unsuccessfully tries to bind Bella, Edward, Benjamin, Zafrina, and Kate to the Volturi during the conflict in Breaking Dawn, only to be blocked by Bella's shield that blocks mental powers. Chelsea's power is described as a fluttering pressure against Bella's shield.