The best replacement for ryu is scorpion.

The best alternatives to ryu are rated as following:
★★★★★  scorpion
★★★★★  ken
★★★★  sagat
★★★★  akuma
★★★  goku
★  jin
★  liu kang
★  ken rap battle
★  taylor swift
★  kazuya
★  shotokan
★  goju ryu
★  wolverine
★  fei long
★  scorpion video
★  kyo
★  guile
  strider
  evil ryu
  evil ken
  raiden
  chun li
  iron fist
  shotokan karate
  ryuu
  bison
  ken street fighter
  subzero
  ken street fighter iv
  m bison
  megaman

Your alternative for ryu is not listed? Suggest!
Speaking about ryu, one probably shouldn't forget about chun li.

Other search terms related to ryu and their ratings are:
★★★★★ chun li
★★★★ demons
You have in mind a companion for ryu and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of ryu in all years. Click on graph for more.
ryu
scorpion
ken