Naming all the characters starting from bottom to top (some names I made up myself because I never seen and don't know those characters):

1st Row: Hong Meiling, Flandre Scarlet, Koakuma, Cirno, Marisa Kirisame, Reimu Hakurei, Remilia Scarlet, Sakuya Izayoi, Daiyosei, Patchouli Knowledge, Rumia
2nd Row: Ran Yakumo, Chen, Yukari Yakumo, Yomu Konpaku, Alice Margatroid, Yuyuko Saigyoji, Lily White, Lyrica Prismriver, Merlin Prismriver, Lunasa Prismriver, Letty Whiterock
3rd Row: Reisen Inaba, Mystia Lorelei, Wriggle Nightbug, Moko Fujiwara, Kaguya Houraisan, Keine Kamishirasawa, Hulk Keine, Erin Yagokoro, Tewi Inaba
4th Row: Iku Nagae, Tenshi Hinanawi, Suika Ibuki, Yuka Kazami, Aya Shameimaru, Medicine Melancholy, Komachi Onozuka, Shiki Eiki
5th Row: Sanae Kochiya, Shizuha Aki, Minoriko Aki, Momiji Inubashiri, Nitori Kawashiro, Hina Kagiyama, Suwako Moriya, Kanako Yasaka
6th Row: Yamame Kurodani, Utsuho Reiuji, Parsee Misuhashi, Kisume, Yugi Hoshiguma, Rin Kaenbyo, Satori Komeiji, Koishi Komeiji
7th Row: Nasrin, Hijiri Byakuren, Ichirin Kumoi, Unzan, Sho Toramaru, Kogasa Tatara, Nue Houju, Murasa Minamitsu
8th Row: Catfish, Sumireko Usami, Kokoro Hata, Hatate Himekaido, Bigdoll, Mechaman
9th Row: Miko Toyosatomimi, Seiga Kaku, Futo Mononobe, Tojiko Soga, Yoshika Miyako, Kyoko Kasodani, Mamizo Futatsuiwa
10th Row: Kagero Imaizumi, Seki Banki, Wakasagi, Yatsu Tsukumo, Benben Tsukumo, Seija Kijin, Shinmy Sukuna, Raiko Horikawa
11th Row: Doremy Sweet, Ringo, Junko, Seiran, Hecatia Lapis Lazuli, Clownpiece, Sagume Kishin
12th Row: Eternity Larva, Aun Komano, Teireida Mai, Okina Matara, Satono Nishida, Tanned Cirno, Narumi Yatadera, Nemuno Sakata
13th Row: Mayumi Jotugu, Saki Kurokoma, Keiki Haniyasushin, Joon Yorigami, Shion Yorigami, Kutaka Niwatari, Urumi Ushizaki, Yachie Kicho, Eika Ebisu
14th Row: Sunny Milk, Luna Child, Star Sapphire, Akyu Hieda, Kosusu Motoori, Rei Sen, Yorihime Watatsuki, Toyohime Watatsuki
15th Row: Rinosuke Morichika, Miyoi Okunoda, Lily Black, Kasen Ibaraki, Renko Usami, Maribel Hearn, Tokiko, Shuri Uchimura, Taiga Uchimura
16th Row: Olive, Kedama, Satsuki Rin, Layla Prismriver, PC98 Blonde Marisa, PC98 Reimu, Yoki Konpaku, Obake, Sendai Hakurei
17th Row: Elis, Yugen Magan, Singyoku M, Singyoku F, Schoolgirl Mima, Kikuri, Kongara, Sariel
18th Row: Genji, Rika, Mima, Matenshi, Noroiko, Meira
19th Row: Rikako Asakura, Kotohime, Chiyuri Kitashirakawa, Yumemi Okazaki, Kana Anaberal, Multi, Mimi, Rukoto, Ellen (and her cat Sokrates)
20th Row: Ellie, PC98 Yuka, Orange, Mugetsu, Gengetsu, Ponytail Hikariko, Kurumi
21st Row: Shinki, PC98 Alice, Yuki, Mai, Sarah, Louise, Yumeko
22nd Row: Blue Haired Louise, Hikariko, Wayosei, King Kard, Ayana, Demonica
23rd Row: Purple Dress Yukari, Commander Rika, Evil Eye, Fierce Kasen, Natsuki Shin, PC98 Yuka in pajamas, Restauranter Mystia, Ruimea Harukei, Kimono Yugi
24th Row: Milia, Yuitia, May, Mei, Vivit, Muse, Hirano, Marie, Morgan, Tolia, Felia, Ilia
25th Row: Sanyo Komakusa, Misumaru Tamatsukuri, Momoyo Himemushi, Takane Yamashiro, Mike Gotokuji, Chimata Tenkyu, Tsukasa Kudamaki, Megumu Izunamaru
26th Row: Usagi Mochizuki, Aya again in different clothes, Himawari, Tewi again, Meido, Kappy, Tanuki Kid, Empress Lunaria
27th Row: Deirdre, Jackie Doll, Myoren Byakuren, Biker Hijiri, Medidoll, Mamizo again in different clothes, Agent Mamizo, Mitori Kamashita
28th Row: Mami, Labelle Hoshi, Jackie Croix, Beerko, Zanmu Nippaku, Hisami Yomotsu, Biten Son, Chiyari Tenkajin, Enoko Mitsugashira
29th Row: Detective Satori, Mizuchi Miyadeguchi, PC98 Redhead Marisa, Bimbo Flandre, Whitedress Joon, Whitedress Shion, Yuma Totetsu, Captain Murasa
30th Row: Blue Reimu, Rainbow Birdwings, Undershirt Reisen, Scarf Sakuya, Guitarist Mystia, Vocalist Kyoko, Dark Angel Rumia, Junya Zun Ota, Policewoman Kotohime