Chica's form has been massively changed, to the point where she barely resembles her original appearance. This is due to the attempted retrofit and subsequent abandonment of the old models, in favor of the Toy Models.
For a start, the feminine features have been toned down and she appears more androgynous as a result. Her body seems to have minimal changes. Perhaps, the most disturbing changes are in the head area: Chica's eye sockets are now much larger than the eyes themselves, and she lacks eyebrows as well as her eyelids. Furthermore, like in the first game, her eyes are magenta in color. Her feet also have three talons, rather than two talons from the first game.
Her beak has been reshaped and turned into a jaw like Bonnie and Freddy have, which appears to be completely unhinged. Her beak also is more pointed, like that of an actual chicken and she has even more teeth on her upper and lower beak. The infamous second set of teeth from the animatronic itself is also clearly visible. She has two stumps where her hands used to be, with long wires pouring forth.
It also seems she is unable to lower her arms down to her side for some reason, as every instance of her has them raised and stretched out as if she is "T-posed" (models in games with no animation are generally posed this way). However, as evidenced by her appearance in the Right Air Vent, she can still raise them up, but this may also be because the small space in the air vent is forcing her arms up. UPDATE 1/31/2015: added ODF styled Color codings EDIT 2/6/15: Changed some stuff and added a thumbnail
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