Having done much soul searching about this topic of great philosophical importance, I've reached the conclusion that the ideal powerset & aesthetic for a forcemasc-themed superhero would be an Ultraman-style giant tokusatsu hero.
I'm thinking a shy, introverted closeted transmasc finds a crashed UFO and ends up bonded with a superpowered alien entity, and in order to use his newfound powers for Great Justice he needs to learn to make himself big and noticeable and take up space. Slowly but surely he feels more and more comfortable in his skyscraper-sized, musclebound alter ego, learning to step out of his mild-mannered wallflower persona and be the literally larger-than-life hero the city needs to defend it from interdimensional tentacle demons and giant killer robots and conquerors from outer space!
youre literally so right and he gets to have a magical man transformation and wear spandex and tower over everyone and he grows a giant cock every time proportionate to his own new ginormous stature that alone could demolish a building and he even starts to take up a bit of a cocky egotistical vibe in his hero form like a lot of sentai heroes have and the tentacle demons and various alien space monsters are constantly groping him and feeling him up but in the end he always defeats them with his ultra belt laser beam the only downside is he loves being a giant man so much that he feels uncomfortable changing back and tries to avoid it even going so far as to prolong some fights and then when he does change back after getting used to being a giant man he has a hard time even pretending to be the wallflower he used to be and he is only able to get off in the bedroom if his strap on is HUGE
and all of this makes him SUPER susceptible to being corrupted by some of the more cunning villains who promise they can let him become a man full time but only if he joins them on the side of space demons or who promise to make him into a wild beast who doesnt care about the consequences of his actions who can stay huge and fuck anything he wants and throw shit around and its SO tempting every single time