Theresa Cassidy (Earth-1010)

{{Character Template Liam Cassidy (paternal ancestor, deceased); Patrick Rourke (maternal grandfather, deceased); Sean Cassidy (Banshee) (father); Maeve Rourke Cassidy (mother, deceased); Thomas Cassidy (Black Tom) (cousin); Victoria Donnely (cousin)
 * Image                  = Siryn.png
 * ImageSize              = 250px
 * RealName               = Theresa Maeve Rourke Cassidy
 * CurrentAlias           = Siryn
 * Aliases                = Terry, Sy, Theresa Rourke
 * Identity               = Secret
 * Alignment              = Neutral
 * Affiliation            = Ally of Black Tom & Juggernaut
 * Relatives              =
 * Universe               = Earth-1010
 * BaseOfOperations       = Mobile


 * Gender                 = Female
 * Height                 = 5'7"
 * Weight                 = 130 lbs
 * Eyes                   = Green
 * Hair                   = Red
 * UnusualFeatures        =


 * Citizenship            = Irish
 * MaritalStatus          = Single
 * Occupation             = Adventurer, criminal
 * Education              = Boarding school


 * Origin                 = Mutant
 * PlaceOfBirth           = Cassidy Keep, County Mayo, Ireland
 * Creators               = Chris Claremont; Steve Leialoha
 * First                  = 50 Shades of Grey


 * HistoryText            =

Origin
Theresa Maeve Rourke Cassidy is the mutant daughter of Sean, the mutant who was to become known as the Banshee, and Maeve Rourke Cassidy. Soon after his marriage, Sean Cassidy, an Interpol agent, was sent on an undercover anti-terrorist mission for many months, not knowing when he left that Maeve was pregnant. Shortly after Theresa's birth, Maeve took the infant Theresa with her on a visit to her relatives in Armagh in Northern Ireland. While she was there, Maeve, an innocent bystander, was killed in an IRA (Irish Republican Army) bombing along with a number of other people. No trace of Maeve was found by the authorities and they, and Maeve's relatives who knew of Theresa's existence, assumed that Theresa had also been killed in the explosion and never told Sean that Maeve had had a daughter.

In fact, however, Black Tom Cassidy, her father's cousin and a rival for the love of her mother, had been present at the scene of the explosion and had secretly carried Theresa off with him. Black Tom suspected that Theresa might develop superhuman mutant powers as she grew older, and therefore he intended to raise her secretly so that he might exploit her powers himself. Sean was so filled with anguish when he returned and learned of Maeve's death that he left his ancestral home of Cassidy Keep and threw himself into a series of highly dangerous missions.

Siryn
Theresa's sonic powers emerged at puberty and, a few years later, Black Tom began coercing her aid in committing crimes, whom she called "uncle" out of respect. At one point during high school, Theresa developed a drinking problem. However, Theresa's heart was never in a life of crime and she pursued it because the man who raised her, Black Tom, ordered her to do so. Eventually, Theresa accompanied Black Tom and his partner the Juggernaut to San Francisco.

There, employing the name Siryn, Theresa battled the Utopia Division and several of the X-Men.


 * Powers                 = Banshee is a second generation mutant and possesses sonic acoustic powers similar to those of her father:

Acoustikinesis: The ability to create various sonic effects through the combined action of her vocal cords and limited psionic powers which can only be used in conjunction with the sounds she produces.
 * Sonic Scream: Siryn can cause her vocal cords to vibrate over a wide range of sonic frequencies and produce a volume of sound ranging up to at least 140 decibels. Siryn has thus the ability to shatter solid objects with a sonic scream
 * Flight: Siryn can use the sonic vibrations of her scream as a carrier wave.
 * Sonic Lance: By focusing her sonic vibrations while screaming into an intense beam. This is used as a sort of "battering ram" that can stun or even destroy most solid objects.
 * Sonar: She can use her sonic powers as a form of sonar. By sending out a precise, pure note and listening to the returning, altered wavefront of the note, she can evaluate her surroundings in total darkness with varying degrees of resolution.
 * Sonic Null Field: She can project a field of silence in a area making no sound reach outside the area or no sound outside the area in.
 * Sonic Amplification: She can amplify sound carrier waves allowing her to hear conversations or noises from far off.
 * Sonic Shield: She can tighten sound waves around herself or others near her, making a barrier against outside attack.
 * Vocal Disorientation: The ability to change someone’s balance, by affecting their equilibrium using her sonic scream.
 * Vocal Trance: The ability to subtly influence peoples subconscious mind by changing the tones and vibrations of her voice using sonics, the effects tend towards blatant hypnosis. At times she's been even capable of calming down an enraged Hulk (when his rage is not so intense).
 * Vocal Unconsciousness: The ability to affect the fluid in someone’s ear causing the person to go unconscious.
 * Siren's Song: The ability to influence human beings with a certain pitch of her voice, causing them to fall in love with her without regard to gender or sexual orientation.
 * Sound Immunity: Siryn's hearing and equilibrium are unaffected by the effects of her scream and similar abilities.
 * Superhuman Vocal Stamina: Her vocal cords are tremendously strong, so that she can produce sonic effects through screaming constantly for hours at a time without noticeably tiring or injuring her vocal apparatus. Siryn's vocal cords and the interiors of her throat and mouth are also superhumanly tough, so that the intense pressures and constrictions that she produces do not cause her any injury.


 * Abilities              =
 * Strength               =
 * Weaknesses             = * Her vocal cords are susceptible to injury from excessive strain in using sonic powers. She has also survived major injuries to her throat at the cost of her sonic powers temporarily. Excessive vocal cord strain can also cause her to temporarily lose her powers.
 * A recovering alcoholic.
 * Equipment              =
 * Transportation         =
 * Weapons                =

}}
 * Notes                  =
 * Trivia                 =
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 * Wikipedia              =
 * Links                  =