Molly

Molly is Angel Dust's twin sister and a character in Hazbin Hotel.

Angel Dust
Angel is Molly's twin brother. It's unknown what sort of relationship the two have outside of being blood related.

When asked on what their relationship is, Vivziepop said that they're siblings and their relationship is positive and that she can't say much because a lot of that is after the Pilot.

Arackniss
Arackniss is Molly's older brother. It's unknown what sort of relationship the two have outside of being blood-related.

Henroin
Henroin is Molly's father. It's unknown what sort of relationship the two have outside of being blood-related.

Molly's Mother
Molly has an unknown mom. It's unknown what sort of relationship the two have outside of being blood-related.

Trivia

 * Though she has yet to appear, Vivziepop confirmed Molly is canonically Angel Dust's sister. She is still in development, but is tentatively planned to appear later in the series, along with Angel Dust's other family members.
 * She may appear later in the series, or at the very least be referenced, according to the Sept. 1 Q&A stream. Viv said in her VIVZIE STREEM- MAMBO No -#5 live stream that she wants Molly in the show at some point.
 * Vivziepop said in her VIVZIE STREEM- Test Test -#1 live stream that Angel and Molly are fraternal twins and not identical twins.
 * She is not a demon.
 * She and Angel are about the same height.
 * When asked if Molly is her real name or the name she has in Hell, Vivziepop said that Molly is her real name.
 * Her name, "Molly", is a reference to the drug Molly, also known as Ecstasy. This might also reference her personality and cheery appearance, as Ecstasy causes users to feel immense emotional pleasure, energy, empathy, and altered sensations.