Source: writeups.com

7. Swordsman

Whom? As Hawkeye's circus mentor-turned-criminal mastermind, the Swordsman was one of the few Hawkeye villains who stuck around. Unfortunately for him, in the game of sword vs. arrows, arrows win every possible time. Hawkeye will nail you before you can get within ten paces of him.

There have been multiple Swordsmans (Swordsmen?) over the years, and one even fought Captain America in the last issue.

Why He'll Never Appear: With Hawkeye's circus backstory deleted from the MCU canon, I doubt any of his weird, quirky characters would make the cut. No Trickshot, no Swordsman, no weird clown friend. Nada.

Hey, if I'm wrong, I'll be super thrilled.