Gavial. Tomimi is effectively an antagonist in it for no real good reason, they retconned Gavial's lore in the lamest fucking way imaginable, and Eunectes which is set up to be an antagonist (but not a villain, don't get me wrong) isn't really. They had a whole theme of technology+progress vs. tradition and simplicity going on and butchered it for the sake of vaguely racist tropes instead.