The best replacement for robin is slade.

The best alternatives to robin are rated as following:
★★★★★  slade
★★★★★  batman
★★★  speedy
★★★  nightwing
★★  kato
★★  oriole
★★  red x
★★  teen titans
★★  robin
★  karate kid
★  robyn
★  deathstroke
★  richard
★  wren
★  terra
★  superboy
★  raven
★  bucky
★  lily
★  jubilee
★  lily hotter
★  batgirl
★  towhee
★  cardinal
  susan green
  maurice
  catwoman
  ziggy
  nora
  mutiny
  nami
  yama
  rally robin
  quinn
  5 guys
  american robin
  tracy
  sabrina

Your alternative for robin is not listed? Suggest!
Speaking about robin, one probably shouldn't forget about batman.

Other search terms related to robin and their ratings are:
★★★★★ batman
★★★★ howard stern
★★ starfire
★ adam west
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