The best replacement for cheerios is oatmeal.

The best alternatives to cheerios are rated as following:
★★★★★  oatmeal
★★★★  honey nut cheerios
★★★  special k
★★  puffs
★★  corn flakes
★★  raisin bran
★★  shredded wheat
★★  multigrain cheerios
★  gerber puffs
★  rice krispies
★  special k cereal
★  fruit loops
★  chex
★  kashi
★  grape nuts
★  wheaties
★  bran flakes
★  frosted flakes
★  weetabix
★  kix
★  fiber one
  honey bunches of oats
  joe's o's
  regular cheerios
  lucky charms
  tasteeos
  cheerios
  fda
  mini wheats
  froot loops
  cocoa puffs

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

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



Google Trends

Scale is based on the average worldwide traffic of cheerios in all years. Click on graph for more.
cheerios
oatmeal
honey nut cheerios