4. AEW Star Sammy Guevara
Sammy Guevara was an absolute heat magnet for AEW during his time in The Inner Circle. Even though he is great at being both a heel and a face, Guevara did (and still would) make for an amazing heel.
When The Inner Circle was a heel faction in AEW, Guevara stuck very close to Chris Jericho, forming Le Sex Gods and helping Jericho attack The Elite and Jon Moxley. He also had very good feuds with Matt Hardy and Darby Allin.
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AEW fans loved to hate Guevara when he was with Jericho solely because of his microphone work. Guevara had a fantastic way of getting the crowd to hate him. Guevara can be annoying as a heel, but it doesn't get him "go away" heat; it just makes fans hate him even more.
Guevara as a heel is braggadocious and extremely cocky. It's said that the best gimmicks in wrestling are those when the wrestler takes his own personality, and dials it up to 10, and Guevara did just that.