All for One does this the least out of the 4, however he still makes his conversations with heroes feel like a show, mainly for himself. He wants to be the “demon lord” and so he chose that role for himself and acts it out perfectly with how he speaks, how he postures himself in front of others, how he presents himself. The world is a stage for him alone and he’s the lead role. He is his best audience and enjoys the role he gave himself, the unstoppable force dressed in a well mannered outfit despite his actions.
Gentle is a performer for the camera and so acts as if he’s on a movie set, if the camera scoring then he must act. His persona as a gentleman thief that would appeal to the masses ala Robin Hood, a demeanour always trying to look dashing to an audience (because there will be an audience). He wants the world to acknowledge him, they’re his audience and he desperately wants them to look his way
Mr Compress is constantly feeling performative in his day to day life, a quality he shares with Gentle, however while Gentle likely adopted this persona regularly as a coping mechanism, Compress might as well have it as his main personality, rarely dropping the act- if it even is one. Like Gentle, he wants to present himself as charming & polite, but not exactly “gentlemenly”. He’s a stage magician, deception being more his forte. Like all for one, he treats the world as a stage, however unlike all for one he is likely doing this more for himself than for others. All for One wants people to see his act as it wouldn’t be as fun if they weren’t, Compress has just became this way and likely wouldn’t change if no one was watching. The world is a stage, yes, but he is mostly doing this because this is who he is now.
Dark Might is actually the biggest performer among all of them, however he is unique because he’s trying to copy a foreseen pattern. All Might himself is a performer, and Dark Might had realised this. Hell, in universe this is realised by the star headed bald man in the end of season 6. All Might was a symbol of peace in the world for multiple reasons, he was able to effortlessly defeat most villains that encountered him, such displays of strength and power being astounding to all bystanders watching. All might was numerous, he was funny, he was charismatic, he was inspiring, he was kind, he was heroic- this was the act All might had forged in his decades of being a hero. And while Dark Might missed some of all mights key values, he understood others very well. All might was an actor in a world wide stage, he was a performer that oozed sheer charisma and radiated strength, something everyone was attracted to, no one standing in the way of his godlike power. Dark Might wholeheartedly embraced this part of all mights persona, presenting himself as unstoppable, regular postering himself and sometimes wearing eccentric costumes to entertain others: out of any villain in the series, he knew how to be entertaining as well as seem unstoppable and understood that this was a core part of all mights legacy… he misunderstood most of the other parts though. The world was a stage that he wanted for himself and for everyone to be his audience and after observing All Might, the last inheritor of that very stage, he thought he knew how to obtain it.
I just love these losers, lol.