One of her quotes "Don't call me Auntie Bar ! I'm not that old !" is a Japanese word play on Bar-san (Miss BAR) and Obasan (Auntie, usually refering to an older woman )
M1918 BAR was also used as an Anti-Aircraft weapon against oncoming Japanese fighters and kamikazis. The 40-round magazine, implemented by the Polish Army who used stationary bipods, was added to fulfill it's AA role despite 7 rounds being the sufficient amount to shoot down oncoming fighters
In the game, however, the CG and chibi sprite models should be M1918A2 because the M1918 doesn't have a shoulder plate which implemented in by later models. In addition, M1918's handguard covers both barrel and gas cylinder tube while M1918A2's handguard only covers the gas tube.
Some players like to call her as a 'poi' duplicate. Her hair style resembles the Japanese Navy Destroyer Ship, Yuudachi, in the Japanese Browser Game Kantai Collection(KanColle). AC130, the official GF 4-coma creator, put some Yuudachi reference in his 4-coma in his pixiv. However, at in-game loading 4-coma, those reference was removed due the copyrights.[1]