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Japanese Name: すみか
Romanized Name: Sumika
English Name: Sumika
First Appearance:
Affiliated: Tanabo, Mihoshi Tachibana(Friend) Kenzaburou Daiku(Possible brother)
Japanese VA:

Sumika is a middle school student who met Yuuko in Chapter 112 of the manga, and is a classmate of Mihoshi Tachibana. Although she is seen only in the manga, Sumika makes a cameo appearance in the second ending along with Tanabo. Her parents are known to have a considerable amount of wealth which implies she is the younger sister of Kenzaburou Daiku. If so, this would mean that her last name is also most likely Daiku. In Chapter 136, she mentions that she has an older brother who's into some sport where people can die (ie, Igo Soccer).

Nichijou characters
Trio Sucharaka Mio Naganohara · Yuuko Aioi · Mai Minakami
Shinonome Laboratory Hakase (Shinonome) · Nano Shinonome · Sakamoto · Biscuit 2
Faculty Principal Shinonome · Kousuke Oura · Izumi Sakurai · Manabu Takasaki · Kana Nakamura · Tomioka · Akagi
Class 1-O Yuria Sekiguchi · Makoto Sakurai
Class 1-Q Mio Naganohara · Yuuko Aioi · Mai Minakami · Nano Shinonome · Haruna Annaka · Tanaka · Tsuyoshi Nakanojou · Ogo · Midori Ōmama
Class 2-A Ogi
Class 2-P Kenzaburou Daiku · Koujirou Sasahara · Misato Tachibana · Weboshii · Fe-chan
Fey Kingdom King Albert · Princess Starla · Dolph · Fey Kingdom Soldiers
Others (females) Yoshino Naganohara · Tamamura · Mihoshi Tachibana · Sumika · Tanabo · Kimiko · Yuuko's Mother · Mother Naganohara · Double Cheeseburgirl · Itako
Others (males) Hajime Sakurai · Mi-chan · Nakanojou's Father · Assistant Instructor · Gentleman · Kiyoshi · Policeman · Hirose · Egi Masaharu · Osamu · Ma-chan
Others (animals) Buddy · Karasu · Oguri Cap . Pyon · Kojirou · The deer