First of all, the ability of Uchiha Shisui Sharingan has been clearly set in the official Naruto. Uchiha Shisui's Sharingan illusion is called Betsutenjin, and is known as the strongest illusion among Hokage. During Shisui's lifetime, one was taken away by Danzo. Later, before Danzo's death, in order to prevent Shisui's Sharingan from being snatched away by Uchiha Obito, he activated the Four Symbols Seal Technique to permanently seal this eye. .
In the anime "Naruto", Uchiha Shisui's reputation in the ninja world is similar to that of Namikaze Minato, and Shisui's name on the battlefield can scare away most enemies. But it is a pity that Tian Jingying allowed Uchiha Shisui to die early.
So what level does Shisui's strength belong to among Hokage? Xiao Huo feels that if Shisui is allowed to continue to grow, the worst he can do is become a Kage-level ninja. The genius beyond Uchiha Itachi
Early when Shisui became famous, Uchiha Itachi was still a young kid. Even though Itachi later became the captain of Konoha's ANBU, in Shisui's eyes Itachi was still a younger brother. Therefore, Shisui has been his role model throughout Itachi's life.
In Konoha, Shisui is a descendant of Uchiha Kagami. Because of the Uchiha mirror, Shisui has been a member of the Leaf Village who has implemented the will of fire since his birth. When Itachi was only 13 years old, Uchiha Shisui's ability was recognized by the Third Hokage. Even among the talented Uchiha clan, Shisui's talent was also called the strongest by the Uchiha clan.
Therefore, if Shisui had not died young, Shisui would have definitely become a strong man that Uchiha Itachi could not surpass. Shunsui Shisui
Shisui's Shisui Shunjutsu is a ninjutsu that became famous in the ninja world after the Fourth Hokage Namikaze Minato's Flying Thunder God Technique. Therefore, Shisui is also called "Shunsui Shuishui". The body stops water."
When Shisui was still alive, he met Jonin Ao from Hidden Kiri Village on the battlefield. Facing Konoha's Shunshen Shui, Ao didn't make any pause and then chose to escape. This is the reputation of Shisui Shui Shui, who can defeat others without fighting. Therefore, as an Uchiha clansman, he uses abilities other than Sharingan to make his enemies extremely taboo, which is enough to show Shisui's own powerful talent. Betsutenjin
Uchiha Shisui's Betsutenjin genjutsu is said to be the strongest. In Naruto's setting, Shisui's other gods can invisibly invade the opponent's brain and change the opponent's will. This characteristic alone is enough to feel the unparalleled power of other gods.
On the eve of the rebellion of the Uchiha clan, Shisui once hoped to change the mind of Uchiha Fugaku, a member of the Uchiha clan, through his own genjutsu, which eventually turned into a crisis that the Uchiha clan might be exterminated. The Third Hokage agreed to Shisui's plan after hearing about Shisui's powerful abilities. Therefore, it can be seen from the third generation's affirmation of Shisui's plan that Shisui's other gods must be truly powerful illusions.
Therefore, Shisui's ranking in the ninja world will not be low based on this genjutsu alone. Judging from Shisui's overall development, Shisui should reach the strength of a Kage-level ninja at worst.