Sekiro

If we're counting memory bosses, the hardest generally were whoever I faced next along my journey. Subjectively, I remember hating the Double Apes most, though I couldn't objectively tell you whether I struggled with them more than with SSI, DOH or Owl2. Minibosses, the Headless still trouble me.

Easiest of the Memory Bosses would have to be the Divine Dickhead. Its most dangerous attack is that final flurry, and if you've managed to not die up to that point, you can just let it kill you, wait for it to be over and resurrect instead of doing a mad dance trying to avoid it all.