Well as far as the mane 6 go, I'd say it's a toss up between Twilight Sparkle and Rainbow Dash, though Pinkie Pie is close behind those two. I guess it's because I'm a bit like all 3 mixed together, good and bad parts. I'm extremely school focused like Twilight, which can cause me to have anxiety attacks sometimes (Lesson Zero was like a "Oh I know all about this" type of episode for me), I'm semi egotistical like Dash, and I constantly talk like Pinkie Pie.
However I love Vinyl Scratch and Octavia quite a bit. Probably cause music is sorta like a second life for me.