Ehemm... have you seen episodes about her on TV or in net? I think, you should meet her personality first, if you wanna be like her. I remember, 3 years ago, every girl wanted be like Haruka. They had her personality in mind, because they have never seen her in anime. Now Haruka is not so popular anymore, because she has a different personality. Nevermind.
I think, you should be yourself. Its a the best way. Also, Flannery doesn`t have SO original personality. She is like a lot of girls from anime. Nice, friendly, funny. Honestly, Winona has similar personality, but she is not so popular.