She might encounter Naruto's hidden fears and help him face them. Maybe she'll discover memories Naruto has forgotten or suppressed.
In the fanfiction, Mito Uzumaki may be in Naruto's mindscape to teach him about the power of the Uzumaki clan. She could show him ancient techniques or ways of thinking that were lost over time. She might also use her own experiences as a jinchuriki to help Naruto better understand his relationship with the Nine - Tails.
It could make him more in tune with his Uzumaki heritage.
It could be that Naruto finds a way to reverse time in a small area. This would require an extremely powerful and dangerous technique. He might have to sacrifice something in return, like some of his own memories or a part of his chakra permanently. But if he manages to do it, he could go back to the time when Mito Uzumaki was still alive and bring her forward to the present.
One possible plot could be that Naruto, as Mito's brother, discovers some long - hidden family secrets. Maybe he finds out about a special power that has been passed down in the Uzumaki family but was lost over time. He then embarks on a journey to rediscover this power and use it to protect the village in a new way.
One possible plot could be Naruto discovering his connection to Mito Uzumaki early on. This could lead to him having an easier time controlling the Nine - Tails' chakra as Mito was also a Jinchuriki. He might inherit some of her unique sealing techniques and use them to protect the village in new ways.
One possible plot could be that Naruto time - travels and meets Mito Uzumaki. Mito could sense Naruto's strong chakra similar to Hashirama's. She might mistake him for a descendant of Hashirama at first. Then Naruto could learn about the origin of the Uzumaki clan from her and how they were powerful in sealing techniques. This encounter could also lead to Naruto getting some ancient knowledge about chakra control or sealing that he could use in his own time.
One possible plot could be that through the Edo Tensei jutsu, Mito Uzumaki is brought back to life. She teams up with Naruto. They could face off against an ancient enemy that once threatened the Uzumaki clan. Mito shares her old - world knowledge and skills with Naruto, and together they strive to protect the Hidden Leaf Village from this new threat.
I'm not sure specifically as there could be many different interpretations in fanfiction. It might be about Mito Uzumaki and some sort of fury - related situation in the Naruto universe, perhaps her showing great power or facing a difficult challenge.
In this fanfiction, perhaps Ashura Otsutsuki in the mindscape is trying to convey a message about an upcoming threat to the Naruto world. He could be guiding the protagonist to gather certain artifacts or allies to face this threat. For example, he might lead the character to an ancient temple where a powerful weapon lies, which is crucial to defeat the new enemy.
The main antagonists could be a group of rogue ninjas who are after the secrets of the Uzumaki clan. Since Naruto is Mito's brother, they might target him to get to those secrets.
They could become friends. Naruto has a way of befriending people from different backgrounds. Mito would be intrigued by Naruto's modern - day ninja skills and his unique personality. They could share stories about their lives, with Naruto talking about his friends and adventures in Konoha, and Mito sharing tales of the early days of the Hidden Leaf and her relationship with Hashirama. Through these exchanges, a strong friendship could form.