So Genshiken Second Season Episode 5 isn't terribly different from its corresponding chapters, and , so I won't be discussing much about the adaptation process this time around. I will say though that I'm glad the actors for Angela and Ohno can at least pronounce American R's.
The only changes are a ton of background cosplay that wasn't in the manga, and this imaginary shot of a seductive Angela.
That said, there is a ton of cosplay in this episode and the last, so I've taken the time to try and identify as many of them as I can. I'm unsure of some, and flat out don't know others, so feel free to leave a comment if you recognize one I didn't. I've actually already received a bit of help. For the cosplay in Ogiue's room in Episode 4, most of the answers are .
All cosplay identifications are approximately from left to right, and any Genshiken main cast cosplays I ignore after the first time.
Yamada (Kujibiki Unbalance, the in-universe favorite anime of Genshiken), Manaka (Love Plus)
Panty and Stocking (Panty & Stocking with Garterbelt), Chamber and Amy (Gargantia)
Don Valentino (Cuticle Detective Inaba) (Thanks ), Azazel (Yondemasuyo Azazel-san), Unknown Soldiers, Titan (Attack on Titan) (Thanks eatallhumans)
Miho and Yukari in Anglerfish Costume (Girls und Panzer), Tsukihi and Karen (Monogatari series), Akane and Kougami (Psycho-Pass), Soldier from Attack on Titan, Miku and Rin (Vocaloid), Saaya and Amy (Gargantia), Shima (Stellvia), Kuroko's Basketball, Railgun (?), Neon Genesis Evangelion
Tsukiko (Henneko) (Thanks to ), Sort of Marisa and Reimu (Touhou) (Thanks to ), Hanayo or Rin (Love Live!)
Mami and Homura (Madoka Magica)
Neko and Kushina Anna (K) (Thanks )
Qyubey (Madoka Magica)
Kougami and Akane (Psycho-Pass), Azazel (Yondemasuyo Azazel-san)
Shouko (Valvrave), Unknown schoolgirl, Kyouko and Sayaka (Madoka Magica), Muromi and Otohime (Muromi-san)
Amy and Lukkage (Gargantia)
Rise (Persona 4)
Charlotte in boy's uniform (Infinite Stratos)
Kohsaka Makoto (Rakuen no 7 Shuuhan, an in-universe game)
Neko and Kuro (K), Buratei Marii (Joshiraku)
Madoka (Madoka Magica)
Homura (Madoka Magica)
Motoko (Ghost in the Shell: Arise), Yukari, Saori, and Mako (Girls und Panzer)
(Not a cosplay) Sue making a Katte ni Kaizou reference
(Also not a cosplay) Sue performing a Chai Kick (Kenichi the Mightiest Disciple)