Unsure about my username...

Yup, it's true... I guess you know where's my problem. The reason I write this journal is because I have this username for pretty long, already 3 years. I only changed my username once since when I joined DA. And just to be clear for everyone, first I used this username was because Fluttershy was my favorite character and I realized that I'm too much like her in personality, even a bit in appearance (I have extremely long hair) and these our similarities were the main reason and still are. But I was still new in fandom at that time. But I was never a huge Fluttershy fan, I just liked her the most. I loved too many ponies at once, especially Mane 6. Fluttershy was special to me because of her kindness and shyness which we share and which I admire on characters. But as time passes, we all change our likings eventually. All of my friends and watchers know, who is my favorite now. Which is a pretty long time already. But not just that. Not just she's my most favorite now, but I also love her more, than I ever loved Fluttershy and any other MLP character. I still feel like I share similarities with Fluttershy, but after Rainbow Rocks, season 5 and Friendship Games came out, I slowly changed my opinion to her and I slowly started to lose my interest for her. She disappointed me a lot in mentioned movies and season in certain situations.
So... now I'm really a huge fan of Sunset Shimmer and I would like to have the username related to her. Or maybe both, her and Fluttershy, since I'm still a bit similar to her. I just don't know.
Why? Because I know all of you, even I, got used to this "old" username "Fluttershy626", which became a part of me. But why having it when she is not my favorite anymore and I feel a strong sympathy to other character? Plus, when random people visit my profile, they immediately think I'm Fluttershy fan judging by my username and icon. It makes me kind of tired to explain everyone how it really is.
So what you think? What would you do in this situation? And would it be too hard for you to get used to my new username since I use this one for so long? I'd like to know your opinions.

EDIT: I already decided which username I will use. But I'll change it when I'll finish my new ID and avatar. Probably next month.