Describe the character of Baba (physically, socially and psychologically) in The Kite Runner. How does his character change and what are the reasons?

Baba was a physically imposing man, standing 6'5 with a
thick beard and unruly brown hair. His hands were so large that they seemed "capable of
uprooting a willow tree." His eyes produced a "black glare that would 'drop the devil to
his knees begging for mercy,' " according to Rahim Khan. Khan provided Baba with the
nickname "Toophan agha"--"Mr. Hurricane"--and he was often compared
to a black bear, which, according to legend, Baba once fought with his bare hands. One
of the wealthiest men in Kabul, Baba loved throwing parties and hosting friends in his
study, the "smoking room," which was filled with comfortable leather furniture. He was
always the life of the party and the instant center of attention. During his days in
Kabul, he was a philanthropist, building an orphanage which he designed and financed
himself.

However, his life changed drastically after he was
forced to flee Afghanistan to California. He became a member of the lowly working
class, taking employment in a gas station/convenience store. He eventually lost his
health to the cancer that killed him, and he seems to have lost much of the confidence
that propelled him to his exalted status in Kabul. However, he never lost his respect in
the Afghan community, where people still remembered him as "Toophan
agha."