Kinkaku's Jinchūriki Forms

By eating some of the flesh from the stomach of the Nine-Tailed Demon Fox, Kinkaku, like his brother Ginkaku, gained powers and abilities similar to the Nine-Tails' jinchūriki.

Six-Tailed Form
While enraged, Kinkaku can access a massive amount of Nine-Tails' chakra, enough to enter a more muscular version of Naruto's four-tailed form, but with six tails. However, unlike Naruto's six-tailed form, it lacks the Nine-Tails' skeleton and Kinkaku seems to retain his consciousness. The power of this form revolved mainly around its abnormally long middle tail. With it he could smash entire cliffs to pieces and agitate the ocean enough to create waves, as well as block a torrent of kunai, throw aside a giant rolling tank, and break out of the Shadow Imitation Technique. However, unlike Naruto's demon fox shroud, Kinkaku's seems to lack the corrosive chakra that Naruto gained in his four-tailed form and beyond.

Kinkaku also keeps control and rationality in this state, most likely due to only having the chakra of the beast and not the actual nine tails controlling and influencing his mind