The best replacement for dragon knight is templar.

The best alternatives to dragon knight are rated as following:
★★★★★  templar
★★★★★  nightblade
★★★★  sorcerer
★★★  wing knight
★★★  templar eso
★★★  aran
★★  crusader
★★  sven
★  wing night
★  chaos knight
★  dragon sage
  kamen rider ryuki
  dragon sage rohan
  hero maplestory
  ryuki

Your alternative for dragon knight is not listed? Suggest!
Speaking about dragon knight, one probably shouldn't forget about manta.

Other search terms related to dragon knight and their ratings are:
★★★★★ manta
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dragon knight
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