I found a place for Vampires and Plant-Sims in Nocheat. Since Nocheat and Peculiar are slowly melding (at least on some level), they might show up in Peculiar, too (but only as a side note).

(in Nocheat, Vampirism is viewed as a kind of VD. It's treated with vampircillin but has never been CURED. I had a whole plot about Carmella DeTreville wanting to permanently cure her philandering fiance--and father of her twins--of VD. It failed and she killed him--along with two of her sisters, before she died an early death herself. I haven't shown the plant sim thing yet, but it's an odd side effect of too much Bubble, harmless but disconcerting)