What examples of characterization are used to show the narrator's character in "The Scarlet Ibis"?

In "The Scarlet Ibis," the author uses various examples
and details to show the character of the narrator. The narrator is the older brother of
Doodle. As the older brother, he admits that he is ashamed of Doodle because Doodle is
handicapped. He admits that he has a mean streak. This is evident when the narrator
shows Doodle the little coffin that had been made for him when he was first
born:

When I
made him touch the casket, he screamed. And even when we were outside in the bright
sunshine he clung to me, crying, 'Don't leave me, Brother! Don't leave
me!'

The author reveals more
about the character of the narrator as he is so ashamed of his handicapped brother until
he decides he will teach Doodle to walk.

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I was embarrassed at having a brother of that age
who couldn't walk, so I set out to teach him. We were down in Old Woman Swamp. 'I'm
going to teach you to walk, Doodle,' I
said.

This took great effort,
but the narrator finally accomplished his goal and taught Doodle to walk. When the
family saw that Doodle could walk, the mother began crying for joy. Next, the reader
sees the true character of the older brother when he begins
crying:

'What
are you crying for?' asked Daddy, but I couldn't answer. They didn't know that I did it
just for myself, that Doodle walked only because I was ashamed of having a crippled
brother.

Clearly, the older
brother had taught Doodle so much. However, his motives were selfish. He did everything
for Doodle out of shame of his little brother's
handicap.

In the end, Doodle dies, and the narrator is hard
on himself, feeling that Doodle's death is his fault. When the narrator stretches
himself over Doodle's body,  he begins crying because Doodle is dead. At this point, the
reader realizes how much the narrator has truly loved his brother
Doodle.