Lydia

Lydia Martin is a of the main character and the current female lead of Teen Wolf. She is the daughter of Natalie Martin and Mr. Martin, and the granddaughter of Lorraine Martin and her wife Maddy. She is also the girlfriend of Stiles Stilinski and best friend of Scott McCall and Malia Tate. When first introduced, Lydia could be as described as a shallow, vain, mean-girl who played dumb to hide just how smart she really was. However, after she became friends with Allison Argent, Scott McCall, and Stiles Stilinski, Lydia began to shed this persona and has since grown into a brave, compassionate person who genuinely enjoys helping others who are struggling, particularly those who have been traumatized by the supernatural like herself.

At the end of Season One, Lydia was attacked and bitten by then-Alpha Werewolf Peter Hale, but in a shocking turn of events, she neither died nor turned into a Werewolf herself, a feat that was virtually unheard of in the supernatural community. However, she began to hear voices, go into fugue states similar to sleepwalking, and have terrifying hallucinations about Peter, revealing that, unbeknownst to her at the time, Peter's attack had activated the latent Banshee abilities that she had inherited from her paternal grandmother. 

It was eventually revealed that his attack against her also allowed his spirit to live on in her mind, affording him a connection with Lydia that he could use to manipulate her into resurrecting him with a special ritual on the Worm Moon. Even after he had vacated her consciousness, Lydia began to be drawn to dead bodies in Beacon Hills, particularly those whose deaths were related to the supernatural, and began unconsciously screaming, which steadily began to worry her. It was eventually revealed to her by Jennifer Blake that Lydia was, in fact, a Banshee, also known as the Wailing Woman, a harbinger of death who was drawn to the dead and the supernatural.

Since this revelation, Lydia has struggled to learn the full scope of her powers and how to use them, often lamenting the fact that her powers were passive, spontaneous, and largely out of her control, unlike the comparatively easier-to-use powers of shapeshifters such as her Werewolf and Werecoyote friends that could be used both actively and defensively. Despite her frustrations, Lydia's ability to sense imminent death has given the pack numerous advantages in battles, though very few people give her credit for just how powerful she is. When the Deadpool started in Beacon Hills in January 2012, Lydia was the second-highest valued target at $20 million, both as a result of her powerful ability to foretell death and the equally-powerful and unique pack who was sure to fight to protect her.

Recently, due to injuries sustained when Theo Raeken entered her mind to sense her memories, Lydia became temporarily catatonic, causing her to be admitted into the supernatural ward of Eichen House. While there, Dr. Gabriel Valack performed trephination on her, which amplified her abilities to the point that she briefly possessed extra-sensory perception. It was confirmed by Alan Deaton in Amplification that Lydia is an exceptionally powerful Banshee, even despite the fact that Lydia still does not yet know the full extent of her powers, which is likely at least part of why Valack was so determined to use her to figure out the identity of the Beast of Gevaudan.

As of Lie Ability, Lydia was rescued from Eichen House and returned to her loved ones, with Alan Deaton using mistletoe paste to reverse the effects of Valack's trephination and causing her to lose her extra-sensory perception. However, thanks to Meredith Walker, a fellow Banshee and a friend an ally of Lydia and the McCall Pack, Lydia has since learned how to use her voice as an offensive weapon, allowing her to channel the power of her voice through her hands to create concussive blasts that can forcefully throw a grown person backward away from her. This combined with her newly-learned close-quarters combat skills, taught to her by Jordan Parrish, has given her the ability to better defend herself from threats even if the pack is not around to assist her.

In Season 6, Lydia's powers have continued to grow, which included Lydia experiencing an astral premonition of a past event in 1987 where she was able to physically interact with another Banshee, Lenore, and she demonstrated the ability to use her scream to kill a Ghost Rider and the phantom version of Claudia Stilinski that they conjured. As of the end of the first half of the final season, Lydia has graduated from Beacon Hills High School and has been accepted to the Massachusetts Institute of Technology, where she will be starting college as a junior.