The Fūma Clan is a ninja clan that is distantly related to the Uchiha clan, but even when the are related to the Uchiha they lack the Sharingan.
Everything changed the night that Itachi killed his clan, a child from the Fūma clan awakned the Sharingan for the first time while training at night after the academy.
Hearing about the Uchiha Clan Massacre the next morning the child decides to hide his Sharingan and kept secret out of fear of Itachi.
The child is a genius, but similar to Shikamaru he plans to be an average shinobi living an average peaceful life as a guard in Konoha away from danger without the need to use the Sharingan ever.
What the child doesn't know is that he is Indra reincarnation, so it is impossible for him to live a life away from danger, as his destiny is ether to fight with Asura reincarnation, or to save the shinobi world with him.