Sirius Knight

His name isn't even Sirius.  It's Shawn.  Sirius is just his way cooler middle name.
Sirius is a part of the "Bro Squad", known as the quieter one of the group, even if he isn't THAT quiet.  He's often lost in thought or in his daydreams, but he always tries to be the level headed voice of his group of boisterous friends.  He loves metal and punk music and going to concerts, as he has dreams of being part of a band at some point in his life.  He plays the drums!
Sirius doesn't have that great of a relationship with his mother, Leah, and he barely knows his brother, Rocket.  He refuses to talk with his dad, no matter how many times he secretly reaches out to him.  Because of this, he tends to spend time by himself and keep himself isolated, or at least spend all his time with his girlfriend in their cheap apartments.  He'll talk to his grandfather despite Leah's warnings.
Sirius means well and always tries to do the right thing, though it's hard for him to admit he's wrong.  When he's nervous, Sirius will rub his wrists, an old habit of his.  Despite not being close to his family, Sirius wishes he was, and the conflicts can make him come off as grouchy to others, but he does not mean to be such a grump.