4. Itachi Uchiha
Itachi Uchiha was the son of Fugaku, and brother of Sasuke Uchiha. He was a fast learner. Itachi was a pacifist, and to avoid a war between his clan and Konohagakure, he massacred his whole Clan except for his brother. Itachi Uchiha had Awakened the Mangekyou Sharingan, which gave him the power to use Tsukuyomi, and Amaterasu. He was also able to summon a Susanoo which carried the Yata Mirror and Totsuka blade, making him invincible. This makes him one of the strongest Uchiha of all time.
3. Obito Uchiha
Obito Uchiha was a shinobi of Konohagakure, who later became a disciple of Madara Uchiha. Half of Obito Uchiha’s body was made of Hashirama Senju’s cells, giving Obito a great amount of chakra and allowing him to awaken the Mangekyou Sharingan. He could use Kamui allowing him to become intangible and teleport himself, and other things to different dimension. Later, Obito also gained the Rinnegan, and he even became the 10 Tails Jinchuuriki during the 4th Great Ninja War.