Naruto in the Baryon Mode is being hailed as his most potent form as of yet. In this state, Naruto’s hair becomes spikier, standing up on its ends with tufts on each side of his head appearing as fox ears. His whisker markings become thicker, with the upper ones on each side curving up below his eyes. The pigments around his eyes become black and stretch up towards his makeshift fox ears, and he takes on Kurama’s red-slit eyes. Although this mode comes at a tragic price, there can be little doubt about the fact that it buffs Naruto’s raw strength to superhuman levels.
The coloring of his own clothes turns slightly darker orange, and he also gains a chakra cape with a black swirl in the middle of his chest. Flowing from the back of his cape are four orange and red in the anime chakra tails, with five more at the end of the cape, each tail has a black line down the center that connects in the middle of the cape as a swirl.
As powerful as Baryon Mode is, it is extremely dangerous if used for too long or recklessly. Doing so will gradually drain at the user’s strength and very lifespan. Because of the extreme risk, the user must not make any unnecessary movements, nor act on any stray thoughts, focusing on only the most calculated of moves to keep Baryon Mode stable. Even more, over-usage of this form comes at even greater risk at Kurama’s life altogether, effectively killing it.
Upon reaching the breaking point, Kurama’s entire being will be destroyed, depriving Naruto of all the kitsune’s chakra and also capacities. However, the removal of Kurama from its jinchūriki will not endanger the latter’s life.
Sources: YouTube Aman Kumar, Narutopedia, CBR.com.