Stanley is fourteen years old and one of his major character traits is his feeling of inferiority. He thinks the curse that has been on his family also affects him and so feels like he should accept the bullying of his classmates and his difficult life.
Another character trait he had was that he was unwilling to accept the blame for his own mistakes. He simply transfers the blame to his great-great-grandfather and can be pretty impertinent about it.
Stanley is generally a good person, however, and certainly is not eager to cause anyone harm. The fact that he gets blamed for stealing the shoes is ironic because he really hadn't done anything wrong and didn't deserve the harsh punishment.
Stanley is also caring. Immediately upon arriving at the camp, he begins to make friends because he goes out of his way to be nice to other people and stand up for the boys.
Stanley demonstrates courage by being willing to take the rap for crimes he didn't commit at camp. He does so in a couple different occasions and this raises his esteem amongst the boys tremendously.