What purpose does Marisa even serve when the only yu's that can't defeat "him" (as he's usually the daddy) are Reimu and Patchy? The whole thing with everyone just giving up and never doing a thing to resist (save for occasionally trying to run) the moment Raper Alice shows up seems so cheap. It also makes no sense if literally no Yu's from a normal herd can stand up to a Raper either, there just isn't a chance there'd be any Yu's left. Take this picture, Marisa is obviously unwilling, and obviously in fine physical shape. So why doesn't he just fight back? A comic like http://yukkuri.shii.org/post/show/37494/alice-chinese-danger-hy835230-koyukkuri-marisa-pre makes so much more sense and becomes a better story because of it. Not that this was a serious attempt at storytelling or anything, having two panels and all.
In board game they call it Aura of Terror Happens when meeting Raper, predator yukkuri, or unspokable abomination from the farthest corner of the universe