What are some actions that depict Obierika as Okonkwo's alter ego in Things Fall Apart?Can you describe the actions?

An alter ego is one who acts in another's absence. Also,
there are the following definitions:

1. a second self; a
perfect substitute or deputy: His adviser acts as his alter ego during his
absence.

2. an inseparable friend.
3. another aspect of
one's self.

Considering these definitions, Obierika is a true,
inseparable friend to Okonkwo. When Okonkwo is exiled, Obierika proves his friendship.
He makes money from the yams that Okonkwo left for him. Obierika visits his friend in
exile to give him the cowries from Okonkwo's yams and to share disturbing news about the
white man who has arrived.

Obierika is Okonkwo's best
friend. The two share many memorable moments. When Okonkwo is exiled, Obierika questions
the tradition that sends Okonkwo away. Obierika ponders such actions on behalf of his
friend.  He is a man who thinks deeply about such legalistic measures such as exiling
one for an accidental shooting:

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Unlike Okonkwo, he is a thinking man. He
questions the circumstances that are sending his friend into exile, even while trying to
console Okonkwo and taking care of Okonkwo's preparation for
departure.

While Okonkwo is
in exile, Obierika visits him and shares how the white man has come in to change things
in Okonkwo's village and the surrounding villages. He shares how the village of Abame is
wiped out by the white men's guns. When a white man arrived on his bicycle, the people
of that town did not know what to make of the stranger. Therefore, they killed him and
hung his bicycle in a tree. When other white men arrived, they came in Abame and
destroyed everyone:

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Three white men arrived with a large number of
African attendants. They saw the bicycle and left. Several weeks later, three white men
and a group of African subordinates came into the Abame marketplace armed with powerful
guns. They shot everyone in
sight.

When it was nearing
time for Okonkwo to come home from his exile, Obierika built new huts for Okonkwo and
his family:

At
the end of the seven-year exile, Obierika builds Okonkwo two huts and sends for
him.

Truly, Obierika is
Okonkwo's alter ego in that the two of them are best of friends and inseparable.
Also, Obierika acts in Okonkwo's behalf and makes preparations for his friend's
return.