Hidden Byakugan

There exist many different applications of the Byakugan, knowledge either repressed by the Hyuga Clan or simply undiscovered because of their heavy focus on the Gentle Fist.

Genjutsu: Byakugan
While the Byakugan is not specialized to apply genjutsu like the Sharingan, it is possible. With the powerful sight of the Byakugan, the user can apply genjutsu to travel through their sight, instead of a direct "mirror" like the Sharingan. This makes the genjutsu of the Byakugan less detailed than Sharingan genjutsu, unable to create vivid illusions. Instead, however, Byakugan genjutsu can mainly be used to paralyze targets, give them sensations of pain, and even give them the feeling of losing chakra.

Genjutsu with the Byakugan itself can travel long distances, though it is most accurate when eye contact is made directly with the Byakugan

Chakra Spirit
By entering a total state of concentration and calm in their mind, a skilled user with a Pure Byakugan (Byakugan that possesses more of Kaguya's chakra, mainly from the head family) can enter a state known as a "Chakra Spirit", in which the user will entirely vanish and be able to go at unbelievable speeds, able to shut down chakra points in an instant before they even realize.

Reflection
The Byakugan is able to entirely reflect any attacks, shown with assisting with Kenan's Menshen Mangekyou Sharingan ability, giving it the ability to reflect any damage done to the barrier back to its caster.