Jiraiya could be a possible teacher. He's always been Naruto's mentor in the original series. In this fanfiction, he could have some knowledge of magic and teach Naruto the basics. He could show Naruto how to combine his existing ninja skills with magic, like using magic to enhance his Rasengan.
His magic could be related to his chakra control. Maybe he could turn his chakra into different elements of magic, like fire magic similar to his Fireball Jutsu but with a more magical twist. For example, instead of just a normal fireball, it could be a fireball with runes inscribed on it for extra power.
Naruto would probably be excited at first. He has always wanted to help Sasuke and this would be a great opportunity for him to do so. He'd be eager to share his skills and knowledge.
In this fanfiction, Naruto would interact with Vesemir, the old and wise Witcher. Vesemir could see Naruto's potential and help him understand the history and traditions of the Witchers. Naruto would also run into the various monsters in the Witcher world. Instead of just fighting them right away, he might try to communicate with them first, like he did with some of the tailed beasts in his own world. His interactions with these creatures would be unique and could even change the way Witchers view certain monsters.
His friends like Sasuke, Sakura, and Kakashi would surely support him. They have been through a lot together and know Naruto's good heart and leadership potential.
Hermione would definitely be one of his biggest supporters. She is intelligent and has a great understanding of the wizarding laws and politics. She could help Harry with formulating policies and making sure they are well - thought - out.
His friends like Sakura and Sasuke might step in to take care of him. Sakura, with her nurturing side, could handle feeding and cleaning him. Sasuke, though he might seem reluctant at first, would probably also protect the baby Naruto from any threats.
Twilight Sparkle could be one of his friends. Since she is very intelligent and into learning new things, she would be interested in Naruto's ninja skills and knowledge.
I think Hinata would also be an ally. She has always been in love with Naruto and would support him no matter what. And the rest of the Konoha 11 would probably be his allies too. They have all fought together and have a sense of camaraderie. With Naruto as a god - like figure, they could help him spread his message of peace and use his powers to protect the village and the world at large. They would be the ones who understand Naruto the best and would be there to assist him in any way they can.
He could potentially ally with other characters who also have an interest in the Zerg. Maybe some of his ninja friends who are intrigued by his new form and abilities. Or perhaps he would find unlikely allies among the Zerg themselves, like a group of Zerg that are more peaceful or have a common enemy with Naruto.
A British mage might struggle to fit in at first. In the Naruto world, power is mainly based on chakra. But the mage could start by using their magic secretly. For example, they could use magic to heal wounds in a way that's different from medical ninjutsu. Eventually, they might teach some of their magic to Naruto characters or learn from them about chakra. It could be a two - way exchange of knowledge and skills that would change the Naruto universe in unique ways.