I have a Theory the Constant is a endless cycle of Purgatory that was opened up by William making him represent death (Maxwell) And Charlie as the aftermath/afterlife. Each character was brought into the constant because of their unfinished business in their life causing Maxwell to make them a deal to bring them to purgatory. And each character has a different death at a different time.
Wilson: Died during the aftermath of the earthquake by his potion melting his face off. Willow: Played with Fire and met her demise that’s why she doesn’t die when getting inside fire because that’s how she died. Wolfgang: Died due to possibly using things to make his body stronger or possibly led poison. Wendy: Possibly jumping off something or doing bad things with a rope. Abigail: Murdered Possibly. WX-78: He was made by either Wagstaff or Wilson Wickerbottom: old age Woodie: Either rope stuff or a tree accident. Thus making it why he loses sanity faster near treegaurds? Lucy: Illness or something else. Wes: Died durning some time in the 1666s as a little chimney sweeper boy (as shown on his Victorian skin this makes his death because of lung cancer) but if your picky clowns died from led in there face paint long ago. Maxwell: Crushed in the Earthquake rubble Charlie: Crushed as well Wigfrid: Possibly died doing something stupid with real weapons. Webber: I think he died by being head butted in the chest by a goat. And in the Purgatory world he was eaten by a spider. Winona: Died in the workplace as the building exploded on her. Warly: Possibly food poisoning?? Wortox and Wormwood were both created in the world so they didn’t die. But Wortox is an imp (Hell) and Wormwood is a plant (nature/heaven?)