Hannah is sweet, kind, polite and good-natured. She is also the opposite of her evil brother, Sid.
She likes to play with her toys and dislikes her brother taking her toys apart and her dog, Scud acting stupid.
She has dark brown hair and white shoes. When she is first seen, she has a pink t-shirt with butterflies and purple shorts. When she is next seen, she wears a purple shirt and light green shorts with flowers. When she is last seen, she wears a white shirt with flowers and pink shorts.
When Hannah is first introduced, Sid takes Hannah's Janie doll after he comes home from Pizza Planet, and swaps its head with Sid's pterodactyl, effectively scaring her. She then reports him to their mother while Sid tries to convince her that she has been lying.
Later, she finds Buzz Lightyear with his arm broken off. Thinking this to be just another toy abused by Sid, she borrows him for her tea party as "Mrs. Nesbit" by dressing him with a pink apron and hat. The other dolls at the tea party are headless dolls that Sid has previously wrecked (Buzz calls them "Marie Antoinette and her little sister").
Much later, Hannah answers the door, not knowing that Ducky, one of the Mutant Toys, has rung it as part of Woody's strategical scheme to save Buzz from Sid. Soon, Sid's pet dog Scud, who is chasing another Mutant Toy, the speedy Frog, rams into her, knocking her down as he exits onto the porch. Annoyed at Scud for his stupidity, Hannah closes the door in Scud's face, locking him out.
When Sid becomes frightened of toys after his toys come alive in front of his face, Hannah takes revenge on her brother by shoving her new doll Sally (apparently a replacement doll for Janie) into his face and chasing him into his room, trying to scare him even more.
Hannah Phillips scares her brother Sid with her new doll.
She is similar to Mufasa from The Lion King, Molt from Pixar's next film A Bug's Life, Neera from Dinosaur and Lenny from Shark Tale. All five of them have antagonistic brothers (Sid Phillips, Scar, Hopper, Kron and Frankie).
It is unknown whether or not Hannah actually believes Sid when he told her about his toys coming to life in front of him as he is the only human to have witnessed it. Regardless of these circumstances, she sees the opportunity to back at him for tormenting her and destroying her toys when she now finds him terrified of his toys including her Sally doll.
She and Buzz are the only Toy Story heroes who are related to the villains.