Brianna Maxwell is Nikki's younger sister appearing in the 2003 Warner Bros. Animation series, The Dork Diaries. She has brown hair and green eyes. She is voiced by Grey DeLisle. Her main outfit is composed of: a blue short sleeved dress, white socks and pink shoes. At her age, she is 6 years old. At her romantic dance with Manny, her outfit is composed of: a blue sleeveless dress and blue high heels.
- Elizabeth Maxwell (Mother)
- Albert Maxwell (Father)
- Nikki Maxwell (Older Sister)
- Ruby Maxwell (Oldest Sister)
- Manny Heffley (Love Interest)