The best replacement for follower is leader.

The best alternatives to follower are rated as following:
★★★★★  leader
★★★  fan
★★  leader quiz
★★  following
★★  disciple
★  christian
★  fan of jesus
★  friend facebook
★  believer
★  leader interview question
★  following on facebook
★  attendant
  fan book
  leaders
  passive follower
  pioneer
  imitator
  gray follower
  srpp

Your alternative for follower is not listed? Suggest!
Speaking about follower, one probably shouldn't forget about magic find.

Other search terms related to follower and their ratings are:
★★★★★ magic find
★ current mirror
opamp
You have in mind a companion for follower and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of follower in all years. Click on graph for more.
follower
leader
fan