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Related Clues:
- Part of many a superhero's life
- Second person?
- Half a superhero's identity
- Lone Ranger, to Tonto
- Closest pal
- Closest bud
- Batman, to Bruce Wayne
- Bruce Wayne, for one
- Captain Marvel, to Billy Batson
- Jekyll, vis-Ã -vis Hyde
- 19-Down, for one
- Intimate confidante
- Change conceit for other self
- Hidden or second self- in Latin
- One's other self