The setting of the Greaser's neighborhood in The Outsiders affects Pony by making him act "tuff". For example, the "hood" setting almost forces Pony to act like a greaser. Pony tries to dress and talk like greaser because that is the norm in his neighborhood. For example, Pony describes the Greasers as "almost like hoods; we steal things...and have a gang fight once in a while.(3)"
In The Outsiders, Darry affects Pony because Darry is very protective of him. Ever since their parents died, Darry felt like it was up to him to protect Ponyboy. For example, when Ponyboy stays out very late with Johnny, Darry gets mad at Ponyboy because he thought he lost Ponyboy. "'Another hour and I would have had the police after you. Where were you Ponyboy?'(49)" Since Darry gets so mad at Pony when he does something wrong, Pony tries to stay out of trouble as much as he can.
Sodapop affects Ponyboy in The Outsiders because Pony strives to be just like Soda. For example, when Pony is describing Soda at the beginning of the book, he says "Soda tries to understand, at least, which is more than Darry does... I love Soda more than I've ever loved anyone...(2)". This shows how Pony looks up to Soda, and cares a great deal for him. Pony doesn't want to grow up too fast like Darry, Pony wants to be lively and childish like Soda.