Born Susan Montero, Flower was a member of the counter-culture revolution of the 1960s, typically identified as a "hippie" or "Flower child." By her own confession, she has been part of several communes and cults in her lifetime and has enjoyed experimenting with recreational substances, such as weed and cocaine.
To the other ghosts, she has explained the main differences between the two was that the commune still let her wear their shoes and contact her family, which the cult did not. In both communities, she was married and in a "throuple" (a romantic relationship between three people).
Flower has spoken about relationships with other women, but as she has the attention span of a gnat and is an unreliable narrator at best.
Her ghostly ability is to make other people high by walking through them.
Flower was assumed to be sucked off (ascended to heaven) at the end of season 2, however they later found out she'd fallen into a well and gotten stuck.
Since returning, she and Thor resumed their relationship alongside Nancy as a throuple, though she and Thor would like to break that up.