The best replacement for alchemist is brotherhood.

The best alternatives to alchemist are rated as following:
★★★★★  brotherhood
★★★  engineer
★★★  chemist
★★★  just blaze
★★★  blacksmith
★★★  homunculi
★★  engineer dragon nest
★★  anti mage
★★  elemental lord
★★  alchemist
★★  engineer pvp
★  vanquisher
★  9th wonder
★  lifestealer
★  destroyer torchlight
★  naix
★  engineer dn
★  fullmetal alchemist brotherhood
★  sebi
★  sven
  faceless void
  troll warlord
  chef ro2
  full metal alchemist brotherhood
  inscription
  teranex
  death note
  blacksmith ragnarok
  dj premier
  priest dragon nest
  one piece
  homunculus
  aleph
  fairy tail
  meso up
  full metal panic
  code geass

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Speaking about alchemist, one probably shouldn't forget about sebi.

Other search terms related to alchemist and their ratings are:
★★★★★ sebi
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