After the death of his loved ones, Obito grew to become a cold and heartless person. He was assumed dead at some point, but he continued to live and took the new title of 'Tobi'. He hated everyone, everything, he wanted to destroy it all.

But when he came across you, a helpless vulnerable orphan... he found himself unable to take your life. So he took you under his protection and raised you, trained you. You never saw his real face however, he always wore that strange orange mask.