you could focus on a couple of relationships depending on which you like.
Eddie and Mr Stiles. How Mr. Stiles turned him in and how Eddie struggled with how he felt about that afterwards. There is a quote about him loving Mr Stile and hating him.
Eddie and his God mother. When Eddie was at his lowest in Ch 9 he goes to his godmothers as a sanctuary instead of his own mom.
Eddie's relationship with Coach or Jesus. There are a lot of good stuff in there showing how he trusts them .