What does "all over him" mean? and in what situation can it be used?
In this context, 'written all over him' indicates that it's obvious that Shulley would become a great 'future scarer'. 'Written all over (someone)' is used in situations when you're trying to talk about someone's obvious characteristics. Ex: Look at him. He's got 'ignorance' written all over his face. Ex: She's got 'diva' written all over her.