How does the tortoise compare to the character of Okonkwo?

Tortoise is mostly unlike Okonkwo.

Tortoise has a sweet tongue, whereas Okonkwo knew "how to kill a man's spirit."

Possible similarities:

Tortoise is ungrateful towards the ones who help him.

Okonkwo is ungrateful towards villagers he regards as weak or lazy, but they do not really help him as much. He is grateful towards those that help him, and shows his gratefulness and sincerity.

Tortoise is wide-traveled. Okonkwo shows evidence of having been to all the villages of the Igbo.

Both Tortoise and Okonkwo suffer a fall.