Brandon T. Snider said this quote

Fluttershy is a natural beauty with gentle, serene ways. Despite her shy and unassuming nature, Fluttershy has a unique gift with animals. Her sweetness and sincerity can charm every animal, from tiny woodland creatures to the most powerful of mythical beasts, making her a valuable asset to her friends in all their adventures. Although she's afraid of heights (very embarrassing for a Pegasus) and shies away at the slightest sound, Fluttershy has no problem confronting grumpy manticores or scolding greedy dragons. While she lacks confidence, she has an inner strength that comes out when others are in trouble. Fluttershy has a lot of fears to overcome, but one day her strength of character and enormous heart will make her a force to be reckoned with.