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- "Guderian is it?"
- "The StuG III is an amazing tank that fought back the Russian onslaught during Winter War! Apologize to the Finnish!"
- ―Erwin about the StuG III
Erwin is a second-year student from Ooarai Girls High School. She's also a member of history buffs club or Reki-jo. She's also the radio operator of the Hippo Team and she operates a German Sturmgeschütz III.
Erwin is a girl with short blonde hair and a pair of brown eyes. She wears a German Field Marshal's Cap modeled on that of Erwin Rommel, and an identical Afrika Korps General's jacket as to the one Erwin Rommel wore in North Africa, although she later trades in this jacket for Ooarai's black uniform jacket whilst in matches. Her hairstyle resembles the ears of the Fennec fox, also known as the "Desert fox". Erwin Rommel nickname was "Wüstenfuchs" which translates to "Desert fox".
Erwin is well known for her expertise on European history, especially World War II. She is decisive and confident, like her historical counterpart, displaying this in an almost cocky smile most of the time. She only loses her nerve in the most desperate of situations.
- The name Riko means "village" (里) (ri) and "child" (子) (ko).
- Her alias name Erwin means "respected friend" in German.
- Riko's surname Matsumoto means "pine tree, fir tree" (松) (matsu) and "base, root, origin" (本) (moto).
- Her nickname is based on German Field Marshall Erwin Rommel, possibly the most famous General of World War Two and Military author of World War One (He authored the book Infantry Attacks see: Infanterie Greift An) His nickname, the Desert Fox, is reflected in Erwin's hair cut. His famous peak cap and Utility shirt is also part of her attire, replete with captured British goggles.
- Interestingly, it seems that Erwin and Caesar share the command of Hippo Team, given that Erwin is never present at the strategy meetings.
- Her favourite flower is Cornflower and her favorite tank is the German Jagdpanther.
- Erwin's birthday is the June 18th, the same date in 1940 as both Winston Churchill's "Finest Hour" speech to the House of Common of the Parliament and Charles de Gaulle's famous Appel du 18 Juin (French for Appeal of 18 June) considered as the origin of the French Resistance.
- Main article: Erwin/Gallery
|Ooarai Girls High School||Anglerfish Team||Miho Nishizumi ♦ Saori Takebe ♦ Hana Isuzu ♦ Yukari Akiyama ♦ Mako Reizei|
|Duck Team||Noriko Isobe ♦ Taeko Kondou ♦ Shinobu Kawanishi ♦ Akebi Sasaki|
|Hippo Team||Erwin ♦ Caesar ♦ Saemonza ♦ Oryou|
|Rabbit Team||Azusa Sawa ♦ Aya Oono ♦ Ayumi Yamagou ♦ Yuuki Utsugi ♦ Karina Sakaguchi ♦ Saki Maruyama|
|Turtle Team||Anzu Kadotani ♦ Momo Kawashima ♦ Yuzu Koyama|
|Mallard Team||Midoriko Sono ♦ Moyoko Gotou ♦ Nozomi Konparu|
|Leopon Team||Satoko Nakajima ♦ Hoshino ♦ Suzuki ♦ Tsuchiya|
|Anteater Team||Nekota ♦ Momoga ♦ Piyotan|
|Shark Team||Ogin ♦ Murakami ♦ Cutlass ♦ Flint ♦ Rum|
|Miscellanous||Taiga Ou ♦ Sadoka ♦ Mazoe|
|St. Gloriana Girls High School||Darjeeling ♦ Orange Pekoe ♦ Assam ♦ Rosehip ♦ Rukuriri ♦ Nilgiri ♦ Vanilla ♦ Cranberry ♦ Earl Grey|
|Saunders Girls High School||Kay ♦ Alisa ♦ Naomi ♦ Helmet-Chan|
|Anzio Girls High School||Anchovy ♦ Carpaccio ♦ Pepperoni ♦ Amaretto ♦ Gelato ♦ Panettone|
|Pravda Girls High School||Katyusha ♦ Nonna ♦ Klara ♦ Nina ♦ Alina ♦ Ekaterina ♦ Olga ♦ Polina ♦ Natalia ♦ Lisa ♦ Mo ♦ Zemlya ♦ Neba|
|Kuromorimine Girls High School||Maho Nishizumi ♦ Erika Itsumi ♦ Koume Akaboshi ♦ Leila Rou ♦ Emi Kojima ♦ Geshiko ♦ Sangou ♦ Mauko ♦ Sheska ♦ Manami Himuro ♦ Runa Onizuka ♦ Kirishima|
|Chi-Ha-Tan Academy||Kinuyo Nishi ♦ Fukuda ♦ Haru Tamada ♦ Hosomi ♦ Nagura ♦ Hamada ♦ Teramoto ♦ Ikeda ♦ Kubota ♦ Nishihara|
|Jatkosota High School||Mika ♦ Aki ♦ Mikko ♦ Touko ♦ Lili|
|BC Freedom High School||Ribbon Warrior||Asparagus ♦ Moule ♦ Bordeaux|
|Das Finale||Marie ♦ Andou ♦ Oshida ♦ Sofue ♦ Isabe|
|Blue Division High School||El ♦ Tristana ♦ Viridiana ♦ Andalusia|
|Koala Forest High School||Wallaby ♦ Platypus|
|Bonple High School||Ribbon Warrior||Jajka ♦ Uszka ♦ Pierogi|
|Maginot Girls Academy||Éclair ♦ Fondue ♦ Galette ♦ Madeleine ♦ Colombier|
|Count High School||Noemi Kohiyama ♦ Anna Masukura ♦ Nachigami Sisters ♦ Marina Constantinescu ♦ Mizuki Ikarashi|
|Tatenashi Girls High School||Shizuka Tsuruki ♦ Rin Matsukaze ♦ Haruka Endou|
|Tategoto High School||Aung|
|Maple High School||Trout ♦ Amber ♦ Oleo|
|Kebab High School||Bosphorus|
|Bellwall Academy||Tiger I Crew||Emi Nakasuga ♦ Hitomi Yuzumoto ♦ Kita ♦ Takami ♦ Nagisa Shiratori|
|Jagdpanther Crew||Neko Yamamori ♦ Yano ♦ Koharu Sakai ♦ Kanbara ♦ Hirono|
|Elefant Crew||Chifuyu Doi ♦ Terauchi ♦ Wakasugi ♦ Kunihiro ♦ Nogata ♦ Enami|
|T-44 Crew||Youko Minami ♦ Saionji ♦ Azuma ♦ Hokuto|
|Panzer II Crew||Kashiwaba Sisters|
|West Kureouji Grona Academy||Kiri Shiratori|
|All-Stars University Team||Alice Shimada ♦ Azumi ♦ Megumi ♦ Rumi|
|Japan Sensha-dō Federation||Ami Chōno ♦ Shiho Nishizumi ♦ Renta Tsuji ♦ Chiyo Shimada ♦ Shichiro Kodama ♦ Kikuyo Idegami ♦ Kanon Sasagawa ♦ Hibiki Inatomi ♦ Remi Takashima|
|Non-Affiliated||Yoshiko Akiyama ♦ Jungorou Akiyama ♦ Hisako Reizei ♦ Shinzaburo ♦ Yuri Isuzu ♦ Chihiro Yusa ♦ Boko|