Let's start with an explanation: It's easy to keep up with the characters' heights, correct, because they're all listed, and not the weights, because the girls are self-conscious. So I wanted to make a height-chart for quick reference, so it's going up here.

Shortest:
Cream, Charmy < Tails < Amy < Blaze < Sonic, Shadow, Silver, Jet < Rouge < Knuckles, Espio, Wave < Storm < Omega < Vector < Big

Ho-hum. That was actually kind of boring. Maybe I'll make an illustration later and edit this page. Just wait, you. Just wait.