Naruto's character would likely develop in several ways. Firstly, he would become more confident in his abilities outside of his normal ninja skills. Dante's training would expose him to different forms of combat and power, so he'd be more adaptable. Secondly, Naruto might become more patient. Dante's training methods could be very different from what he's used to in the Hidden Leaf, so he'd have to learn to take things at a different pace. Finally, he would gain a new perspective on friendship and loyalty as he bonds with Dante during the training.
When Naruto is trained by Dante, his character develops in multiple aspects. His sense of determination gets even stronger. Facing Dante's tough training regime, he refuses to give up, just like he always does in his own ninja training, but now at a new level. He also becomes more strategic. Dante's combat style is full of tactics, and Naruto starts to incorporate these into his own fighting style. Emotionally, he grows as well. He forms a deep bond with Dante, which teaches him about different types of relationships. This new relationship enriches his understanding of trust and respect, and he starts to apply these lessons to his relationships with his comrades in the village.
Naruto's character development would be quite significant. Since Dante is a very experienced and powerful fighter, Naruto would learn a great deal about self - discipline from him. He would start to see the value in precise and calculated moves rather than just relying on his brute strength and chakra. Also, through Dante's training, Naruto would become more worldly. He'd be exposed to different cultures and ways of thinking from Dante's world, which would make him more open - minded. This would also affect his relationships with his friends back in the village. He'd be able to bring new ideas and a broader view to their group, making him an even more important figure in their community.