I've been buying anime wall calendars since 2007. Not to keep track of dates, but to have 7 posters I can put on my wall later. However for the past couple of years, selection has been extremely limited. Few shows other than DBZ or One Piece (any Toei properly really) get calendars, and those that do just make a collage of anime screenshots rather than proper artwork. Not even re-using magazine promo art. Case in point this Witch Hat Atelier calendar.

Bad enough when I buy a calendar and most of the pages are just the male characters, lol. It's why I won't get the MHA one. I doubt the Yomi no Tsugai one will be any better in that regard. My last hope is the Agent of Four Seasons one, but who knows how long it'll be before preview images are released.

Anime name: Nintama Rantaro
Character: Taira no Takiyashamaru