This is my first post here on the forum so I apologize if I make any formatting mistakes.
With 101 released volumes, there are now 101 characters featured on the back cover of Detective Conan volumes. Practically every single character that had at least some form of an impact on the story has their own keyhole, and then some. Several one-off characters get there own keyholes too: Haga Kyosuke (46), Bartender Lady (81), Vampire Maid Lady (79), etc. It's important to note that those were all "memorable" one-off characters. Aoyama is so desperate to find new keyhole characters that Vermouth appears four times: Chris Vineyard (26), Sharon Vineyard (35), Scar Akai (78), and Enomoto Azusa (90).
Do you think that this scarcity of untouched characters will eventually reach a point where the course of the whole story shifts so that Aoyama can feature a new character?
After all, every single keyhole character appears in the volume they are on (Even Okino Yoko in volume 17 (she's in one panel in the background of a thought)).
Also, who do you think is next in line to get their keyhole?
My bet is Hagiwara Chihaya.
Finally, who do you think should get their keyhole ASAP?
My choice is Itakura Suguru
Here's a list of notable characters who haven't gotten keyholes yet:
Lupin (Suzuki Jirokichi's Dog)
Rum (without disguise)
Alright, now that I listed them there might be quite a few left. But some of these characters like Futoshi Ejiri and Iwao Ida don't have a reason to return.
What do you all think?