Possible Questions:
- Sidekick
- Substitute
- Trusted friend
- Hyde, to Jekyll
- Doppelganger
- Mr. Hyde, e.g.
- Second self
- Mr. Hyde, for one
- Inseparable friend
- Clark Kent, for one
- Bruce Wayne, to Batman
- Batman, for Bruce Wayne
- A different you
- Very close friend
- Tony Stark, to Iron Man
- Spider-Man, for Peter Parker
- Other self
- Mr. Hyde, for Dr. Jekyll
- Half a superhero's identity
- Clark Kent, to Superman
- Tony Clifton, to comic Andy Kaufman
- Superhero's cover
- Second shelf
- Sasha Fierce for Beyoncé, once
- Perfect substitute
- Perfect deputy
- Part of many a superhero's life
- Other I
- One of the "three faces of Eve"
- Mr. Hyde, to Dr. Jekyll
- Jekyll, vis-Ã -vis Hyde
- Intimate confidante
- Evil twin, perhaps
- Drag name, for example
- Captain Marvel, to Billy Batson
- Bruce Wayne, to Batman, e.g.
- Bruce Wayne, for one
- Bruce Wayne, for Batman
- Batman, to Bruce Wayne
- A second self