What similarities are there between Othello and other tragic works by Shakespeare?

Most of Shakespeare's tragic plays feature protagonists
who are possessed of a tragic flaw. The flaw is not comprised of actions but of a
tendency in the character's personality that leads him to make poor choices. For Hamlet,
for example, his tragic flaw could be said to be procrastination. For Macbeth, it's
ambition.  For Richard III, it's arrogance. For Othello, it's jealousy. These tragic
flaws are often at the root of the behaviors that cause the play's primary action or
conflict; for example, if Richard were not so arrogant, he wouldn't alienate so many of
his allies. If Othello were less jealous, he wouldn't murder Desdemona based on an
accusation and fabricated evidence.

But alongside tragic
flaws, each of these characters also tends to have a character who brings out the worst
in them: for Hamlet, it's his mother; for Macbeth, his wife; for Othello, his manservant
Iago. These characters can be seen as reflecting the dark side to the protagonist's
personality, a kind of moral mirror that encourages the character's worst
impulses.