Kurama.

Relationship with Naruto Initial Hostility: For most of Naruto's youth, Kurama was a "caged demon" plotting to take over Naruto's body by feeding on his rage. He callously mocked Naruto's weaknesses and hoped to break the seal to regain his freedom. Turning Point: During the Fourth Shinobi World War, Naruto's sincere desire to save all the Tailed Beasts and treat them as individuals—rather than weapons—cracked Kurama's shell of hatred. True Partnership: The two eventually formed a legendary bond of mutual trust. Naruto removed the seal entirely, and Kurama proudly declared himself Naruto’s friend and teammate. This synergy allowed them to unlock powerful forms like "Kurama Mode" and eventually "Baryon Mode". Ultimate Sacrifice: In a final act of love, Kurama sacrificed his own life to protect Naruto during a battle against Isshiki Ōtsutsuki, choosing to die so that his friend could live.Background & Origin Creation: Thousands of years ago, the Sage of Six Paths, Hagoromo ?tsutsuki, used his "Creation of All Things" ability to split the chakra of the Ten-Tails into nine separate bodies. Kurama was the strongest among them. Enslavement: Over centuries, humans viewed Kurama as a "natural disaster" or a "tool for war". He was manipulated by Madara Uchiha and later sealed within three successive hosts (Jinchūriki) from the Uzumaki clan: Mito, Kushina, and finally Naruto. The Sealing: During Naruto's birth, Kurama was extracted from Kushina and forced to attack Konoha. Naruto's father, Minato Namikaze, sacrificed himself to seal the Yang (light) half of Kurama into newborn Naruto and the Yin (dark) half into himself. Identity & Persona Personality: Kurama is portrayed as snarky, shrewd, and intensely proud. He uses the "washi" (ワシ) pronoun, typical of older men, to denote his age and wisdom. Cynical Worldview: Centuries of being treated as a "mindless monster" led him to develop a deep-seated hatred for humanity also he is over 300 feet tall (byeeee pookies✨️✨️)