As far as I know, there isn't a class-based multiplayer shooter with bare-assed birds like these. But dammit, there should be. Japanese Twitter user Takio-chan, who now works as a CG graphic designer, recently uploaded these character models, which were done while in vocational school.
No wonder they have been retweeted well over 15,000 times. They're terrific, flat butts and all.
— ❤︎タキオちゃん❤︎ (@mhgt_1017) January 19, 2016
Also love this illustration.
Top image: Takio-chan