I'm just rooting for Asakura, the pure-hearted little cinnamon roll. Also Subaru who is infinitely more interesting than his sister.
Well, to be fair, they're both fairly interesting and also fairly mundane. Both have their good and bad points. Personally I like that Tsukasa is pretty okay with having a crush on a girl instead of fretting over it being a girl. That to me is fairly interesting in and of itself. She's also high spirited and rather unselfish which makes her quite fun. Plus she seems mad good at soccer.
Subaru might have the cross dressing thing, but he's otherwise very withdrawn and focused on his sister. His interactions with Asakura are good for him, but he appeared quite one dimensional for a long time. It's good to see him coming out of his shell more. He has to deal more with his personality whereas Tsukasa has to deal more with others and her feelings for them (or lack thereof).
it's late and I might have rambled off subject, but the point is, I think we identify things in characters that we like or don't like based off our own personalities. There are a wide variety of characters here with many different personalities, so it's okay to think one more interesting than the other. I just personally think they're all rich and vibrant with their quirks. Even kotooka's mom is a funny one.