Theresa Cassidy, or Siryn, made her debut back in Spider-Woman #37. Sheâ s gone from a former criminal at Black Tomâ s side to the rightful daughter of Sean Cassidy, aka Banshee.

Siryn, whose real name is Theresa Cassidy, is the daughter of Sean Cassidy, better known as longtime X-Man Banshee. As you can see in the image below, Siryn has a green and yellow costume with a ...