I was watching IM3 again, cause why not, and one thing I realized is that even though Harley is a sarcastic little shit(cause he is), he also reminds me of a puppy with those big blue eyes, following Tony around, and I can't get over the fact that he seems so goddamn innocent and nice, while its obvious that he maybe doesn't have the best life, cause he's a nerdy kid, who's dad left, in a rural small city building potato guns, of course the kids getting bullied. His home life doesn't seem the best, since his mom is working late shifts, and you know him disappearing with a rando who showed up at his door(even though the rando is iron man), and almost dying and no one seems to notice like whatt? So I fully believe that as he grew up he started building walls, and being a sarcastic little shit becomes his entire personality to protect himself, because of his daddy issues(which is basically Tony). And even though Tony keeps in touch with Harley, Harley never really tells him stuff that's bothering him, or any problems he have. And Tony trying his best to help him, and take care of him, because he sees through Harley's walls and masks because Tony used to be like that too. And ya I just love both of them, and I feel robbed that we did not see more of Harley Keener in the MCU.