Grumpy Ostrich Girl is Grumpy
The questionable boobs in Devil Survivor 2 are infamous, and I think this girl’s right leg is a separate organism. I also recommend scrolling down to the gallery at the bottom to behold her in-game portrait and its freakishly tiny hands.
She looks grumpy because she's slowly being turned into an ostrich.
(Promotional art of Miyako Hotsuin from Shin Megami Tensei: Devil Survivor 2 Record Breaker)