Edit his personality a little, I don't get much out of it nor do I see much of his characteristics. Is he shy? Is he insecure? Is he defiant? Is he guy who can laugh things off or is he the type of guy whose of afraid of people's opinions? From what I can tell is that Shinji is insecure about his blonde hair and dislikes all the rumours around him. Expand on it a little, is Shinji usually cheerful until his hair is brought up or perhaps he's mean and cold and hard to open up too. Expand on what you have here since he can be interesting character if you bring out his traits and mannerisms more.