What is the nature of the relationship between Jane, Mary, and Diana in Jane Eyre?

St. John's sisters and Jane's cousins, Diana and Mary Rivers are gentle, compassionate, educated young women who take to Jane immediately.

Mary doesn't have much personality, but Diana is a natural leader and teacher.

Explanation:

Jane Eyre is the protagonist and narrator of the novel. Jane is an intelligent, honest, plain-featured young girl forced to contend with oppression, inequality, and hardship. Although she meets with a series of individuals who threaten her autonomy, Jane repeatedly succeeds at asserting herself and maintains her principles of justice, human dignity, and morality. She also values intellectual and emotional fulfillment. Her strong belief in gender and social equality challenges the Victorian prejudices against women and the poor.

Mary Rivers is Jane's cousin, the sister of St. John and Diana. Mary is a kind and intelligent young woman who is forced to work as a governess after her father loses his fortune. Like her sister, she serves as a model for Jane of an independent woman who is also able to maintain close relationships with others and a sense of meaning in her life.

Diana Rivers is Jane's cousin, and the sister of St. John and Mary. Diana is a kind and intelligent person, and she urges Jane not to go to India with St. John. She serves as a model for Jane of an intellectually gifted and independent woman.