The word I am looking for is to describe an intentionally harmful duplicate. Sort of an evil twin, but in a competitive way - one who'd "test your might" in an actual tournament to give you a lesson rather than give you advice how to improve.

I like: adversarious, but it sounds too negative. Customized is too vague.

  • Look into the Inca myth of Piguerao and Apocatequil -twins, gods, and sometimes said to be one in the same – Third News Jun 18 '14 at 8:52

How about "evil or hostile doppelganger" Or 'adversarial'

doppelganger===something or someone that strongly resembles another

  • I thought about doppelganger and I'll roll with something similar. This is the only answer hitting on "duplication" element. – hauron Jun 18 '14 at 8:03

How about nemesis?

Or adversary.

nemesis: the inescapable agent of someone's or something's downfall. "the balance beam was the team's nemesis, as two gymnasts fell from the apparatus"

synonyms: archrival, adversary, foe, opponent, arch enemy


You may be thinking about an antagonist:

  1. One who opposes and contends against another; an adversary.
  2. The principal character in opposition to the protagonist or hero of a narrative or drama.
  • I might have not accented it properly, but the word I'm looking for should consider competition "pro-educational", and in that sense teaching a lesson. Antagonist, in my opinion, doesn't care if the protagonist learns anything. – hauron Jun 17 '14 at 14:32
  • Should that be a person or also something virtual? – user66974 Jun 17 '14 at 14:40
  • I suppose either work: an agent or virtual force. – hauron Jun 17 '14 at 14:45

I like 'viperous' (adj.)--having the qualities attributed to a viper; malignant; venomous. But a simpler alternative might be 'rival'--a versatile word which can be a noun, adjective or transitive verb (competing; striving to equal or surpass).

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