Molly is a young girl with blonde hair and blue-green eyes. She keeps her hair in a braid, that without leaves her hair messy and in her eyes. She shares many of the features her sister has, including their pale skin and her eye and hair color. She most often wears dresses, generally pink with floral patterns. Her eyes are somewhat square with long lashes.
Molly is remarkably sweet, kind, and considerate towards others. It is for that reason both Jude and Rowen are so smitten with her. She is remarkably tolerant, which is necessary for her to be friends with the at times reckless boys in Team Storm Slayer.
Much like her sister, Molly values her family, which has now grown since her joining of Fairy Tail. She is innocent and naive, believing there to be good in everyone. However, this belief is taken from her upon the end of the third Volume, where Molly witnesses the death of Silas, the man who worked for the Brotherhood of Order but helped free Fairy Tail.
While the incident shook her, it did bring out a greater power within that gave her the strength to protect the good against evil.
Molly and Lillian's father died shortly before her birth, and her mother began to search for a new husband to take care of her and her children. She began to see Incubus Welch, who had a young son named Andrew. Lillian was forced to play with Andrew in the yard, at times joined by Molly despite her still being an infant.
They were also joined by Justin, the son of their gardener, who was a close friend to Lillian.