Frankenstein (Actually, it's Ito Junji's Monster)
When I pick up a story by prolific horror artist Ito Junji, there are two things I expect: It’s gonna be good, and it’s gonna be gross. There are a few exceptions at least to the latter point, but his adaptation of Frankenstein delivers on both fronts. If you’re looking for a manga to read for Halloween but want something more classic than Uzumaki or Gyo, this will be a solid choice.