alter ego (n.)

• acquaintance
• advocate
• ally
• alter
• alternate
• analogue
• associate
• attorney
• backer
• backup
• brother
• champion
• cognate
• companion
• complement
• confidant
• confidante
• congenator
• congener
• coordinate
• correlate
• correlative
• correspondent
• counterpart
• deputy
• dummy
• ego
• equivalent
• exponent
• familiar
• fellow
• figurehead
• friend
• he
• her
• him
• image
• intimate
• it
• lieutenant
• like
• likeness
• locum
• lover
• mate
• me
• neighbor
• obverse
• parallel
• partisan
• pendant
• pickup
• picture
• pleader
• procurator
• proxy
• reciprocal
• repository
• representative
• secondary
• self
• she
• similitude
• simulacrum
• sister
• stand-in
• substitute
• such
• superego
• supporter
• surrogate
• sympathizer
• tally
• them
• they
• twin
• understudy
• vicar
• vice
• vicegerent
• well-wisher
• you