Something interesting from the new episode: I think it explained why Bocchi hasn't run into any boys in spite of them being shown in Chapter 13.5: Only 7 out of the 29 kids in her class are boys. http://i.imgur.com/sNkH7mR.png
I decided to see how many of the characters from the picture have we seen in the manga (and everyone else who's gotten a namecard): http://i.imgur.com/FmCSHaJ.png
2: Sunao Nako (Ch1)
3: Ojousa Mayo (Ch29)
4: Sotoka Rakita (Ch9)
7: Futago Nosaki (Ch20, Name card in Ch33)
8: Futago Notsugi (Ch33)
9: Minagawa Rau (Ch41)
11: Hitori Bocchi (Ch1)
12: Yamada Hanako (Ch8, Name card in Ch15)
14: Omoi Kakeru (Ch60)
16: Inakana Mari (Ch45)
18: Onaka Peko (Ch20, Name card in Ch27)
19: Honshou Aru (Ch4)
22: Kurie Ito (Ch20, Name card in Ch27)
23: Himeji Yanai (Ch57)
24: Kurai Kako (Ch 15)
27: Oshie Teruyo (Ch8)
28: Kawai Ino (Ch35)
32: Futou Kou (Ch47)
Others:
Yawara Kai (Ch1)
Nakanai Karane (Ch34)
1,5,6,10,15,30,31: Unknown Boys
13,17,20,21,29: Unknown Girls
25,25: Unknown Teachers
The names of those 12 characters are (Possible Romaji from GJM subs):
29 津吉 望 Tsuyoshi Negai, Seat 2
30 大市 四季 Daichi Shiki, Seat 6
21 池菜 衣子 Chisai Iko, Seat 12
15 金志杉也 Kanashi Sugika, Seat 13
6 玉戸 流人 Tamato Ruhito, Seat 17
20 相田 元気 Souda Genki, Seat 18
17 根賀 まじめ Nega Majime, Seat 20
31 須戸 礼翔 Suto Reito, Seat 21
10 京 藤吉 Kyou Douyoshi, Seat 22
1 徳井 伴斗 Tokui Banto, Seat 25
5 保武 嵐 Houmu Arashi, Seat 26
13 音古賀 らく Nekoga Raku, Seat 27
Okay, so I think I've managed to match the Names to the Characters, based on the order of the names on the front board and a few establishing shots of the classroom. https://imgur.com/a/uVVh2Oh
So, we've seen every classmate except the seven boys and five of the girls, if the picture is to be believed.
I'm curious if C2C made up those other students or if Katsuwo already had them designed and gave them to C2C. I hope they show up in the manga, that would be some really good continuity.