Related Clues:

• Part of many a superhero's life
• Second person?
• Half a superhero's identity
• Lone Ranger, to Tonto
• Annie, e.g.
• Superman, for one
• Rescued dog, e.g.
• One taken in
• Film noir protagonist
• Batman, to Bruce Wayne
• Bruce Wayne, for one
• Captain Marvel, to Billy Batson
• Not-so-noble protagonist
• Anne of Green Gables, for one
• Jekyll, vis-à-vis Hyde