He is usually characterized as extremely intelligent, socially inept, and rigidly logical.
Despite his intellect, he regularly displays a lack of common sense.
The childhood of the character is the focus of Young Sheldon, the show being set in 1989, when 9-year-old Sheldon, who has skipped ahead four grades, starts high school alongside his older brother.
Sheldon is a senior theoretical physicist at Caltech and shared an apartment with his colleague and best friend, Leonard Hofstadter (Johnny Galecki).
He is uncomfortable with human physical contact and has germophobia, which makes his exceptionally rare hugs extremely awkward and painful-looking.
He also has haemophobia, which causes him to faint at the sight of blood.
—he give fans his thoughts on where Sheldon's head is at.
(To this day, the college he went to for undergraduate studies has yet to be revealed, but he feels it is superior to the others' alma maters.) From then, he worked on his doctorate, was a visiting professor at the University of Heidelberg in Germany, was the youngest person at the time to receive the Stevenson Award, Sheldon is often described as the stereotypical "geek".
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He has a superiority complex, but also possesses childlike qualities, of which he seems unaware, such as extreme stubbornness.
He is unknowingly unpleasant to others, even his friends.