Yeah but its not just because they are tsundere, it's because they are unnaturally tsun and because Charlotte is just THAT much better than all of them in EVERYTHING.
K let's do this. Wall of text inc.
First of all, it's because unlike other girls, she isn't constantly contradicting herself, denying any and all sign of interest in him. She is the only one who has acted normal with him both as a guy and a girl and obviously, Ichika can't have enough of her. He even wants her to act like a girl when they are alone
Second, it's because she is very levelheaded and doesn't just rush into things and mess up due to jealousy etc. Even the German girl who has yet to take interest in him talks too much and is thus inferior. She may not have the best specifications or not be the best skilled but unlike other girls, she doesn't talk big and yet she is the one who is brave enough to risk an unfair fight for his sake when IT ACTUALLY COUNTS. She is clearly his shining knight on the horse o.0
Third, it's because she IS very sexy and unlike other girls doesn't go around making an wuss of him for trying to complement or even notice any and all feminine charms. Besides, she is superior to them all in all sense of feminine charm, from body to breasts to face to voice to ass to everything you can think of as a girl's assets and her clearly superior feminine charm has been taken notice of. Ichika actually blushes when he notices her movements.
Fourth, it's because she is playing her cards right. She is just that inviting but isn't a slut by any stretch of imagination. She knows when to say what and is just the kind of girl that knows how to hook a man in not to mention she looks and behaves very honest and easygoing. The kind of woman you want to claim as your wife and be a slave to for the rest of your life. Basically, she actually knows how to nurture a relationship unlike those mega idiot horny teen sluts.
Fifth, it's because she actually has a very very tragic back story - overused though the plot device maybe - that, combined with her good nature, would force any man to wish to protect her. Who can resist coming to aid of a damsel in distress who doesn't force herself onto you? I hate the type that force themselves onto me regardless of whether or not they need me. And Ichika is a respectable (albeit much too dense and academically retarded when compared to me) man like I am. And she doesn't refuse your help or push you out either. She is independent but she is willing to work together. She has led such a rough life and yet she isn't bitter and despite having a personal
IS etc., she doesn't act pompous at all. Just the kind of girl you'd fall in love with if you had been in an academy full of teenage girls that act like they are something fucking beyond this world just because they can use something most other people can't.
Sixth, it's because she is genuinely cute. Her responses are what you'd expect of a girl. She doesn't freak out just because Ichika complemented her. She only has those cute reactions when he touches her or finds her in an awkward situation etc. Screw the rest of the bitches really.
Seventh, it's because she is the only girl who isn't going to murder Ichika the moment he so much as gets involved with another girl. Given Ichika's history and uniqueness, he is most definitely going to be involved with a lot of girls and it would take someone like Charlotte to understand and support him. NOT those women that shoot at him or try to chop off his head for accidentally groping his teacher's breasts.
Eighth, it's because she is benevolent to a fault. She didn't blame Ichika at all for her situation. Most girls I know, both real and otherwise, would despise him for existing to cause them pain of such degree as to being forced to be a man to spy on him. Instead, she is the type that feels easy after telling him her secret. She doesn't blame him for finding her secret either (most girls would prostrate themselves or threaten/try to kill Ichika if he discovered their secret. Also, she doesn't blame and otherwise beat him to death for accidentally peeking at her or for showing some interest.
Ninth, it's because she realizes that it's normal for men to be a bit perverted and she uses that fact in a joyful nature to further bolster their relationship rather than to chide Ichika to a crisp. She isn't exactly easy to get though and Ichika recognizes that she is high class - even if her father was an ass and she lived in the country most of her life - and thus will need to admit genuine interest before he gets some. Still, she is the only girl who actually is fine with that idea and won't freak out while totally otherwise wanting it.
Tenth, it's because all the rest suck compared to her. Yep. Everyone of them.
I could go on and on but I have to sleep.. at least I got ten valid reasons on the board, I think. Maybe we could get a running list going? What say you guys? Just keep adding a reason every time you see a new image or whatever of hers and feel butterflies flying in your groin. Doesn't have to be elaborate, simply state your mind, however perverted :3