i was going to mention the sheik MU too. shiek has a much harder time getting under roy with things like ftilt or dash attack when he goes to short hop. roys superior tilt coverage and ability to navigate quicker in the air vertically means that shiek has a harder time setting up juggles on him. as far as the MU goes, i wouldnt exactly say its advantageous towards roy, cuz i dont believe that it is. but I do think roy has an easier time than marth does with it. also, i agree with the floaties concept, although excluding peach and samus. CC heavy character affect roy a bit more than they do marth, and since roy is a bit slower, it means that hes going to have a harder time supplying pressure to transition out of the neutral game and into combo game. on the other hand it is quite hard for marth to kill the floaties like peach and samus, whereas roy doesnt. im not sure if that difference will balance itself out or not or weigh more towards marth or roy, but the neutral game is general a bit more important.