NO.1: Kurama's Nine-Tails Mode: Kurama is the first Jinchuriki of the Nine-Tails and can easily control its chakra using her sealing techniques. In her Nine-Tails chakra mode, she looks similar to Naruto. 

NO.2: Karin's Senjutsu: As Kabuto's apprentice, Karin has Orochimaru's curse mark and can activate it using the Ryuchi Cave's Senjutsu. Her appearance changes when the curse mark is activated. 

NO.

3: Itachi Uchiha's Susano'o: Itachi was a tragic character who never got the chance to use his Susano'o. However, the official release reveals that Itachi's Susano'o is blue.

NO.4: Madara Uchiha: Madara also awakened the Mangekyou Sharingan but never demonstrated his Susano'o. His Susano'o was likely extremely powerful due to his knowledge and research. 

NO.5: Gaara's Tailed Beast Cloak: Gaara never made a pact with Shukaku, resulting in him never being able to use his Tailed Beast Cloak.