What is the purpose of taking Ikemefuna in things fall apart?

The taking of Ikemefuna to Umuofia from Mbaino was for restitution for the crime of Mbaino killing an Umuofian clanswoman.

The taking of Ikemefuna to the outside the village is for the purpose of killing him.

The taking of Ikemefuna to the river is so that he can help with the chores.

The taking of Ikemefuna to village meetings was so that he could act as Okonkwo's eldest child, bringing Okonkwo's seat among other responsibilities.