Madara Uchiha

Madara's childhood was a product of the times he lived in: the constant fighting made him a perfectionist that would keep at something until he mastered it, and his triumphs on the battlefield made him very confident in his abilities and talent.[28] Whenever one of these personality traits was challenged, as they tended to be by Hashirama, Madara's competitive streak would emerge. Madara did not mind Hashirama's influence in this regard; he believed that the only way to survive in the shinobi world was to make allies with one's enemies. His exposure to Hashirama is credited for Madara not experiencing the Uchiha's "Curse of Hatred" or at the very least, not being victimised by it as much as Izuna was and even though he claimed to have abandoned his friendship with Hashirama, Madara still held onto their friendship subconsciously.Madara's actions and beliefs were singularly focused on protecting Izuna, his only surviving brother.So long as he had Izuna, Madara was reasonable and kind, willing to make concessions for a perceived greater good. Madara changed after Izuna's death, becoming bitter towards the Senju, particularly Hashirama since he still had a brother. Embracing his clan's Curse of Hatred, he opted to die for revenge rather than compromise or forgive.Although he was briefly convinced to set aside his grief and try to replace Izuna with the collective family of Konoha, he could never shake the feeling that he was betraying Izuna's memory. The increasing isolation of himself and other Uchiha from village politics ultimately convinced him of this, causing him to fully break with any other attachments.