Fluttershy is probably maybe my second favorite of the Mane 6 ponies (I say maybe because I think Rarity is also my second favorite).
That being said, she and Twilight are the characters in the series that I relate to the most. In Fluttershy’s case, we both really love animals, are rather shy and introverted, and usually try to avoid confrontation (but I would make the exception to defend someone I care about). Honestly, watching her grow to be more assertive compared to how she was in Season 1 is a real treat and it was very inspirational to me even. I feel that I too learned how to eventually come out my shell and express myself and meet new friends where I wouldn’t have otherwise due to fear and anexity.