"Robot" is an awfully broad category; none of my suggestions involve the giant, piloted, super-powered robots. Monster is very good, but at 72 episodes, is unus

"Robot" is an awfully broad category; none of my suggestions involve the giant, piloted, super-powered robots. Monster is very good, but at 72 episodes, is unusually long for a mature series. You may want to look at Tokyo Godfathers or Planetes first, to see if your interests match mine. "xxxHolic" is a weird Japan-glish word; you can read it as "____-aholic". I've not seen the series and can't recommend either way, but from the Wikipedia article it looks like something you'd not enjoy. Online recommendation engines seem to break when dealing with Japan-related topics; I don't know why, but it could be that some people will watch anything if it's 1) animated 2) from Japan, so the engines build false associations between wildly different works. This happens in music also -- I once listened to an orchestral re-imagining of some soundtrack by the Tokyo Philharmonic, and now Last.FM won't stop recommending awful j-pop.