Who is Ikemefuna in Things Fall Apart?

He is a child that is given to Umofia as a sacrifice, and lives with Okonkwo. From the beginning of the book, it states that he is ill-fated, so we know something bad will happen to him...

He has been living with them for 3 years now, and all the kids respect him. He has kind of became their leader, even though Okonkwo's oldest child is the same age as him.