Well, that depends on your definition of non-sexual. Is it still based on looks, but the kind of areas real people can leave uncovered and still be considered modest? Is it based on personality? If in terms of personality, then I have found myself attracted to Rainbow Dash because she radiates confidence, and I like to have friends who are self-assured, sometimes even bullheaded, as I have found that these are the friends I can depend on most. I am also socially attracted to the character of Fluttershy, as she is shy and tends to show her emotions too easily, a trait which I myself possess. This makes her very relatable to me, and she seems as though she'd be the ideal friend for me. Both ponies are attractive to my eyes in parameters of a social, non-physical relationship. If in terms of looks, the only real difference is the colors, the hairstyles, the eyes, and whether the pony has a horn, wings, or neither. In these circumstances, I would have to say Rainbow Dash, Vinyl Scratch, Luna, and Fluttershy, for a number of reasons. Firstly, in the case of Rainbow Dash, Fluttershy, and Luna, they are Pegasi, and I always found the wings very aesthetically pleasing. Secondly, the coloration: I love Rainbow Dash's beautiful multicolored mane and blue coat, the wonderful pink color to Fluttershy's mane (as well as the way it's styled), the dark edginess to Luna's whole color design in general (season 2 Luna, not season 1), and the nice short-cut blue mane on Vinyl Scratch, conrtasting with her white coat. (Note: whether a pony is a unicorn or not does not affect my opinion of their looks; I could care less about the horn.)Thirdly, the eyes. Rainbow Dash's eyes rarely stop radiating confidence, and I've found being near someone who looks confident can actually help make me more confident, so I personally am a sucker for self-assured, smug eyes like that. Fluttershy's eyes are by far the most expressive of the group, which makes her seem very relatable to me, as she might as well be telling you exactly what she's feeling at any time, as one look to the eye and it's a dead giveaway, something she has in common with me. Luna has a sort of intensity to her eyes, which can be quite intimidating, and theirs something about that that I like. And Vinyl Scratch's eyes are actually never seen except in fanart (some artist swear her irises are red) so there's a sort of mystery there, as if you never really know what she's thinking. I find it intriguing. I'm legitimately surprised I wrote such a winded response to such a simple topic; however, I think this was necessary to properly make my point. It was certainly interesting to take a closer look at what I like in a female's facial features, beyond just symmetry, which biology states we must like. I would like to assert, however, that I have never felt a sexual attraction to any of the ponies because, simply put, the animation style essentially prevents that, and besides that, they're ponies, and while I have no problem with anyone who is, I personally am not into that.