Opening the letter addressed to him, Eli “Hawk” Moskowitz smiled as he saw who it was from: the actor Jacob Bertrand, whom Eli had heard about more than once. Eli felt Jacob did an amazingly awesome job bringing him to life on Cobra Kai, and couldn't help smiling when he recalled an interview he’d found on YouTube with Jacob saying something like “I embody that darkness a little bit” in a sense.

To Eli from season one,
Stay strong. If you join the karate cult known as Cobra Kai, don’t get too sucked in, and don’t buy into it too much. But, you know, you might get a Mohawk and a...

HAWK

NAME
Eli Moskowitz

RELATIVES
Mrs. Moskowitz (mother) (I call her "Lea" in my theory)
Unnamed (father) (In my theory his daddy is Mike Barnes)
Unnamed (Younger Brother) (In my theory his name is Jacob, like Hawk's actor)

FRIENDS
Demetri (best friend; brother figure)
Miguel Diaz (best friend; brother figure)
Johnny Lawrence
Mitch (close friend)
Eagle Fang students
Miyagi-Do students

ENEMIES
Kyler (bully)
Brucks (bully)
Rory (bully)
A.J. (bully)
Robby Keene
John Kreese
Cobra Kai students

LOVE INTEREST(S)
Moon (ex-girlfriend)
Piper (former crush)
Stacy (former crush)

AFFILIATION
Cobra Kai Dojo (formerly)
Eagle Fang...

During the 3rd Karate Kid film and Cobra Kai shows the similarities of both Barnes and Hawk being ruthless and their aggression.
The truth, we don’t know much about Mike Barnes’ background and if he could have also been bullied before becoming Karate’s bad boy and that could be why Mike is so ruthless and mean. His actor, Sean Kanan has been bullied at a younger age and has said in a interview by saying “I was severely bullied when I was young. It was bad. I was a fat little kid with the bowl haircut and glasses. I got into karate and it stopped, but that has always stayed with me.”...