Any ideas for a backstory?

I need help to write a good backstory for a character named Alex Lehman Edurus. He's 14 and is another character, Sid's, best friend. His personality is that he's arrogant, proud, cynical, and at times insensitive. He can be short-tempered at times, but at the same time, he's laid-back and witty... show more I need help to write a good backstory for a character named Alex Lehman Edurus. He's 14 and is another character, Sid's, best friend.
His personality is that he's arrogant, proud, cynical, and at times insensitive. He can be short-tempered at times, but at the same time, he's laid-back and witty when needed. He can also get bored when he at school at times and can be very lazy. He is fun-loving and loves hanging out with his closest friends.

Despite his flaws, he is very loyal and protective of his friends and others and can give very great advice when needed, as shown when he defended Sid from the bullies at school. He's also very street-smart and has a lot of experience of the outside world due to his troubled past. He's also a great chef. Deep down, he doesn't mean to act the way he does and wants to change but doesn't know how.
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