Just starting chapter 1
So, I just started the manga after catching up with the anime a while ago. If you're curious about the people in the image, we can all share our theories.
What I found is that the one with the extremely thin, upward-curled mustache—his distinctive trademark—is Salvador Dalí. I didn't realize it at first, but after searching on Google, I found him. We also seem to have Hitler, Marilyn Monroe (I think), some physicist, Einstein, and Gandhi.