He and nightfire have matching scarfs but when he got infected his memory became foggy. All he knows is he is not supposed to take it off. But not why or who gave it to him.

Also remember shadow tubby = Sammy Lawrence 

(Does not mean he in love with miles. He just wants appreciation from miles for his dedication but he does  it weirdly and it makes miles mad so he kills him every day.

(Miles kills shadow but shadow reforms cause he is made of ink)