Jon Snow

He is kind and compassionate. He understands how hard life is for ordinary people. He loves his family, even if it's not his own.
He is thoughtful and serious, but he knows how to smile.
He doesn't socialize much with girls because he doesn't want the girl to get pregnant and her children to bear the shameful name of Snow. The name of the bastards of the north.
He is polite and well-mannered.
He's smart. The maester taught him well.
Like all Starks, Jon is honest, fair, and stern. Honor and duty mean a lot to him, as they do to all Starks.
He knows his duty as a bastard. He has no business in Winterfell. He wants to go to the wall on the night watch.

John is a good warrior. In the future, he will have no equal in sword fighting.
He is agile and fast. Strong and brave.

Jon Snow's real name is Aegon Targaryen, as he is not actually a bastard. He is the son of Rhaegar Targaryen and Lyanna Stark, Eddard Stark's sister.
He is the true heir to the Iron Throne, but no one knows this except Eddard Stark, because otherwise Jon will be killed.
King Robert still loves Lyanna, even though she died while escaping with her lover and secret husband, Rhaegar.
It is believed that Rhaegar raped and killed her, but this is not true.
One day John will find out who he is

At the beginning of the story, he is 14 years old. The same age as Robb Stark.
Serious, reserved, intelligent.
He is always reminded that he is just a bastard. A nobody.
Despite the attitude of Robb, Arya, Bran and Eddard, he felt like an outsider in their family.
Catelyn Stark always looked at him with an incomprehensible gaze. Not anger, not disgust, but not love either. She couldn't accept him as her son, because he was proof that her beloved husband had cheated on her when he left for war.