Alice is portrayed as being bubbly, tiny, and optimistic; loves and cares for Bella like a sister. She often ignores other people's advice and does things her own way, which usually results in the outcome being better than predicted. She loves to sing with music 3 octaves higher than the song really is with her silvery bell-like voice. She has vicarious fun dressing up Bella "like a three-dimensional paper doll" and throwing parties, and loves shopping at expensive shops in large malls. Alice seems to think that Bella should do everything a normal teenager should do (i.e. love to shop, party whenever possible, etc.) Alice, is also described as being a very fashionable person, going on massive shopping sprees with the money she helps her family make by predicting the stock markets. Alice very much enjoys buying Bella clothing. In Breaking Dawn, Esme furnishes a cottage for Edward and Bella, and Alice stocks the closet with an overflowing amount of clothing. Alice is often disappointed when Bella doesn't dress as she wishes. When Bella turns up wearing jeans and a t-shirt Alice says "Look at you, you need me to show you how to use your closet!" Her adoptive sister, Rosalie Hale shares her intense love for fashion. To Edward, Alice can also be very annoying, as he says in Eclipse when she is telling Bella about the graduation party.

She is very protective over Jasper and makes sure he keeps in line, as well as showing Jasper's warmer side when she is with him.