Who's the person inbetween itachi and shisui?

Shisui and Itachi ! Itachi's Jealous by Sarah927Artworks on DeviantArt

Kotoamatsukami, Narutopedia

If Shisui would have lived, if the writers let you, how strong would you have made him? How would he rank as an Uchiha? - Quora

Shik4maru - Shisui Uchiha —The Best Friend Of Itachi Uchiha.

10 Shisui Uchiha Facts, Itachi Uchiha's Friend Who Awakened Mangekyo Sharingan

Who is Shisui Uchiha? Background, Abilities, Teams, Clans, Powers

2. The Precious Little One, Series 1: The Uchiha Heirs, Uchiha Shisui, Itachi, Sasuke, Sayuri

Who's the person inbetween itachi and shisui?

Shisui Uchiha (Character) - Comic Vine

Itachi and Shisui, an art print by Mimi - INPRNT