The best replacement for ultron is brainiac.

The best alternatives to ultron are rated as following:
★★★★★  brainiac
★★★★  avengers
★★★  thanos
★★  magneto
★★  destroyer
★★  apocalypse
★★  dr doom
★★  amazo
★  loki
★  nokton
★  metallo
★  cyborg superman
  iron man
  megatron
  biogon

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Google Trends

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ultron
brainiac
avengers