Here's humanized Fluttershy and Rainbow Dash! I'm 'bout to drop some serious head-canon so get ready:
I head-canon Fluttershy as a Bisexual Transgender Girl and Rainbow Dash as a Latino Heterosexual Transgender Boy. I ship Rainbow Dash with Applejack and Fluttershy with Pinkie Pie. (And Twilight with Rarity) See if you can spot the Trans* flag! It's in there, you just gotta look for it!