I just realized it, but I feel compelled to mention it. I've been watching a lot of death battle lately, and after watching a couple, it struck me: why aren't there any death battles with Kiritsugu Emiya vs. Spike Spiegel or Shirou Emiya vs. Kirigaya Kazuto (Kirito)? There is not even a single mention, despite my searches on YouTube, fandoms, and polls. That, in my opinion, would have been successful and truly brought a lot of anime fans together to see who will win.