Are there any graphic novel series that Reddit consistently recommends as 'must-reads'?

Several series are frequently mentioned: 'Y: The Last Man' by Brian K. Vaughan and Pia Guerra (post-apocalyptic), 'Hellboy' by Mike Mignola (horror/supernatural), 'Invincible' by Robert Kirkman and Cory Walker (superhero), 'Locke & Key' by Joe Hill and Gabriel Rodriguez (horror/fantasy), and 'The Wicked + The Divine' by Kieron Gillen and Jamie McKelvie (fantasy/superhero).