The best replacement for captains is aizen.

The best alternatives to captains are rated as following:
★★★★★  aizen
★★★★★  reigai
★★★★★  aizen episode
★★★★  akatsuki
★★★★  espada
★★★  kages
★★★  kageroza
★★★  captains
★★  stern ritter
★★  espadas
★  majors
★  arrancar
  aizen bleach

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