Naruto would feel a sense of responsibility. He might think that it's his duty to do something about it. He could start by examining the chains to see if there is any way to break them. He would also be on high alert because he doesn't know if this is some sort of trap. He would be thinking about all the possible consequences of his actions and how it could affect the world around him.
Well, Naruto might first try to free Kaguya. He is a hero after all and doesn't like to see anyone chained unjustly. But he would also be very cautious because Kaguya is extremely powerful and was once a great threat. He could try to communicate with her to understand why she is chained there in the first place.
Naruto might be super excited. He loves making new friends, and a toddler would be like a new little friend to him. He'd probably start showing off his ninja moves to make the toddler laugh.
Well, Naruto would probably immediately try to free her. He's the kind of person who can't stand seeing someone in distress. He might use his ninja skills to break the chains quietly if he's worried about enemies nearby. Then he'd likely ask her who she is and how she ended up there.
He might be quite shocked at first. After all, Wolfstar involves his dad's best friend Sirius and his other dad figure Lupin. It's a rather strange concept for him to think about them in a romantic way as he knew them in a different context.
One interesting take in a fanfiction could be that Naruto finds Orochimaru's lab while looking for Sasuke. He enters the lab full of determination to bring Sasuke back. Inside, he sees the remnants of Orochimaru's attempts to transfer his soul or create powerful hybrids. This discovery makes Naruto realize the full extent of Orochimaru's madness and the danger Sasuke is in. It also gives him more motivation to not only rescue Sasuke but also put an end to Orochimaru's evil plans once and for all.
In the fanfiction, Naruto might develop new skills related to Kaguya's power. As he delves into her story and the nature of her abilities, he could learn to control or even mimic some of her powers. This would not only make him stronger but also change his fighting style. His understanding of the origin of chakra and the world itself would deepen, which could lead to him being more of a philosopher - like figure in the fanfiction. He might start to question the cycle of hatred in a more profound way, seeing how Kaguya's actions were influenced by her own experiences. Also, his relationships with other characters could change. For example, if he discovers that Kaguya had some connection to certain characters in the present, he might treat those characters differently or have a newfound respect for them.
In some fanfictions, Snape might be secretly sympathetic. He may see the scars as a reminder of all Harry has been through, which could soften his usually harsh attitude towards Harry, at least for a moment.
He might discover some new and powerful jutsu hidden there. Maybe it's a lab created by an ancient ninja clan that was lost to history.
Well, she might be a civilian who accidentally stumbled upon the wrong place and was captured by some rogue ninjas using the lab as a hideout. Another possibility is that she is related to one of the main characters in the Naruto universe. For example, she could be a long - lost sister of Sasuke or Naruto. It would add an interesting twist to the story. She could also be an undercover agent from another village who was discovered and chained up in the lab.
He might be really surprised. In alternate universe fanfiction, things could be so different from his own world. For example, he could see versions of himself with different powers or relationships. It would be like looking into a strange mirror that shows a distorted but fascinating view of his life.