Touma Uchiha

K. Touma was born to Kasumi and Fumihito Uchiha in Konoha.  Because of his mother's Yamauchi friend giving her a warning about a very vague but bloody vision regarding Touma, Kasumi leaves Konoha with her son and husband. Fumihito didn't make it after they had been attacked by some bandits- managing to hold them so his wife and child can get away safely. Out of fear for the vague vision, Kasumi changed her last name to Katayama and made Touma go by it as well- shreading away any sign or proof of their Uchiha clan bloodlines and ties. 

At the age of eight, Touma returns home, excited about the new friends he made. But he found her dead in the kitchen, assassinated by an unknown assailant. The pure anger and anguish he felt seeing his only last remaining family killed activated his sharingan and ever since then, he's dedicated his time and efforts to finding her murderer.  He changed his last name ack to Uchiha and proudly donned the clan symbol.