Chica

As i said, chica acts exactly like Springbonnie, however i think she's slightly faster. She will chase you if she sees you, and her eyes go white when she's chasing you. I hate to cut things short, but the fnaf 1 animatronics are not the most interesting things in this game.

(i just edited the Springbonnie description down here).

How to stop her.
Chica seems to just keep chasing you until she either gets you, or you manage to stop her. To stop her, you must get to the office and close the door on her. She will knock on it, and then leave. Springbonnie acts exactly the same.