The best replacement for zack is cloud.

The best alternatives to zack are rated as following:
★★★★★  cloud
★★★  sephiroth
★★★  zach
★★  cody
★★  slater
★  angeal
★  squall
  terra
  sephiroth crisis core
  cloud stronger
  vincent
  zack
  slater from save by the bell

Your alternative for zack is not listed? Suggest!
Speaking about zack, one probably shouldn't forget about ghost adventures.

Other search terms related to zack and their ratings are:
★★★★★ ghost adventures
You have in mind a companion for zack and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of zack in all years. Click on graph for more.
zack
cloud
sephiroth