He would be extremely worried. Tony Stark, despite his tough exterior, loves his daughter deeply. He'd probably start by using all his resources to find her. He has access to advanced technology, so he'd likely use his Stark Industries gadgets to track her down.
He'd be frantic. Tony loves his daughter deeply, so he'd immediately start searching for her. He'd use all his resources, his technology, and his connections to find her.
Tony could be initially shocked. He might not understand why Peter would run away, especially if they had a good relationship before. He'd probably start searching for Peter right away, using all his resources.
In fanfiction, she might run away because of a misunderstanding. Maybe she overheard something she wasn't supposed to and misinterpreted it. For example, if she heard her father talking about some kind of protection plan for her that she thought was him trying to control her life more. It could also be that she has her own secrets, like developing powers that she's afraid to tell her father about and decides to run away to figure things out on her own.
In some fanfictions, their relationship could be a bit rocky at first. Maybe the adopted daughter has a different view on how to use technology for good. But through various events and heart - to - heart conversations, they grow closer and learn from each other, with Tony learning to be more open - minded and the daughter learning the value of his experience.
He would probably be overprotective at first. Tony has been through a lot, and the idea of his daughter having mutant powers, which could make her a target, would be scary for him. He might try to keep her locked away in the Stark Tower, but that would likely lead to her rebelling.
He'd probably be shocked at first. Tony is always so caught up in his own world that a secret daughter would be a huge surprise. But then he'd likely be protective. He might try to keep her away from his dangerous life at first, but as he gets to know her, he'd start to include her in things.
The villagers who once shunned Naruto might start to realize his importance. They would see how much they took his presence for granted. His absence could make them reflect on their past behavior towards him. Some might even join the search parties out of guilt or new - found respect.
Well, it could make her overly independent. Since she's being neglected by Tony Stark, she might learn to rely only on herself. She'll grow up faster, taking care of her own needs and making her own decisions without much guidance from her father.
Perhaps Tony, knowing Peter's character, is somewhat expecting the interruption. He might have a wry smile on his face and then listen to what Peter has to say. He could also play it cool and make a joke about Peter's eagerness to interrupt his meeting, while still giving Peter a chance to explain his reasons.
Tony would also likely expose her to the world of science and engineering from a young age. He might take her to his lab and let her play with non - dangerous parts while he works. This would help her develop an interest in those fields.