This isn't really a slice-of-life series and you can't be talking about the depth of the valley of a female character, so a plot is needed to build that depth. But like I said in my previous post, how much depth can you give a dog..? Pretty much any robot or human in this show gets some marginal depth by default from the ruin, which they all share (though I'm still not sure it directly affects humans), but that's it.