Is Shin Uchiha bad?
Shin Uchiha is
the main antagonist of Naruto Gaiden: The Seventh Hokage and the Scarlet Spring. He has a grudge against Sasuke Uchiha for killing Itachi Uchiha. He desires to recreate the Akatsuki with his clones by the same name, Shin Uchiha. He is a student and test subject of the legendary Sannin, Orochimaru.
How did Shin get Sharingan?
His Sharingan-embedded right arm
was harvested by Orochimaru and transplanted to Danzō Shimura along with some of Hashirama Senju's cells. Some time after this, Shin left Orochimaru's side and took most of his clones with him.
What happened to the shins Boruto?
Ultimately, a timely arrival by Sasuke's wife, Sakura Uchiha, left Shin crippled and forced to retreat back to the separate dimension while capturing Sakura. There,
Shin killed the injured clone so he could harvest its organs as a replacement for his own.
Is shisui Shin Uchiha?
No, he is not. Shin uchiha is a been created by orochimaru and he is an artificial being so there is no way he could be the son of Shisui. Here orochimaru is referring to Shin as being his experiment.