Girl Wearing Superhero Panties

• A headquarters or base of operations, usually kept hidden from the general public (e.g., Superman's Fortress of Solitude or Batman's Batcave).
• A backstory that explains the circumstances by which the character acquired his or her abilities as well as his or her motivation for becoming a superhero. Many origin stories involve tragic elements and/or freak accidents that result in the development of the hero's abilities.
• A weakness or Achilles' heel, whether concrete and external, such as Kryptonite in the case of Superman; or psychological and internal, such as anger and biochemistry in the case of the The Incredible Hulk.