1. Hagoromo Otsutsuki: Hagoromo Otsutsuki is the descendant of his brother Hamura Otsutsuki and possesses the Byakugan, the same eye technique as the Hyuga clan. The Byakugan can evolve like the Sharingan, and after receiving an implant of Hinata Hyuga's Byakugan, Hagoromo awakens the Rinnegan. With the Rinnegan Chakra Mode, Hagoromo is as powerful as Naruto, surpassing regular Sharingan users. The Rinnegan represents the ultimate evolution of the Byakugan, not the Jougan possessed by Boruto.

2. Hinata Tenin: Although never appearing in the story, Hinata Tenin is a character in the Naruto world. Hinata Tenin is the founder of the Hyuga clan and lived during the same era as Hashirama Senju and Madara Uchiha. By witnessing Neji's high-level Gentle Fist techniques during the Chunin Exams, Hinata Hinata mentioned this powerful ninja from the past.

3. Hinata Hizashi: Currently the head of the Hyuga clan, Hinata Hizashi used to believe in the distinction between the main and branch families.

However, after the events involving Neji, Hizashi changed his thinking and sincerely apologized to him. To become the head of the Hyuga clan, strength is required, as it was once known as the strongest clan in Konoha. Boruto also noted that Hizashi has a deep understanding of the Byakugan.

4. Boruto: In the Boruto series, Boruto, son of Naruto and Hinata, awakens the Jougan. It is speculated that the Jougan is not an evolved form of the Byakugan, but a different type of eye technique.

The Jougan is one of Boruto's abilities and is expected to demonstrate its power in future storylines, not being overshadowed by the Sharingan.

5. Hinata Neji: Inconsistent character descriptions exist in the Naruto series, including Neji's abilities. Before Shippuden, Neji was portrayed as a genius ninja surpassing even Sasuke. Despite being from the branch family, as a genin, he could use jutsus of jounin level such as the Eight Trigrams Revolving Heaven.

This is why Hizashi saw a glimpse of a powerful ninja in Neji.