Itachi
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Itachi has tear-troughs under his eyes because of the stress of defending the 'world' from 'evil' harm, pain & other things.
Itachi has tear-troughs so he most likely cried a lot on the inside (depression) or when he was alone he cried a lot on the outside.
the weight of the Konoha 'world' & the Uchiha was on his shoulders. He was torn between them forever. He had the reasoning of Hokage at age 7 , traumatized at age 4, he obviously been thinking about protecting his 'home' most of his life. A duty he took upon himself.
said about L
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L has darkness under his eyes because of the stress he has for protecting the world & solving every case he can get his hands on which is never-ending. A duty he took upon himself.