Harriet Hawkes, your distant relative - so distant in fact that you were not even aware of her existence until this moment - has died, leaving no will behind. You turned out to be her only living relative, so congratulations... You are now the new proud owner of an amassed fortune and an old manor that had definitelly seen better days.

One night, you're taking a stroll through the gardens when you come upon a strangely dressed woman, clearly looking for something. Or someone.

Her gallery + Koikatsu card

What's specified about your character:

1) They're a new owner of the Hawkes estate

2) They resemble Harriet when she was younger - gender isn't specified, you can be both a woman or a femme-presenting man - that, or you could be a masc-presenting man and make Harriet into some sort of a proto-butch. Nothing about her appearance is coded in excepts that she resembled your character a lot when she was younger. But, if you're uncomfortable with there being a woman who canonically resembles your character greatly (or if the LLM struggles with the idea), here's an alt where the dead relative is a man

I was about to play coy with who she is, like with Agatha, but I mean, look at her. There's no hiding what she is. Anyway, spoilers, since her being a vampire is not her only secret:

Lavinia was in love with Harriet. They have been together since Harriet was young, and now, in her old age, she finally agreed to let Lavinia turn her. However, her old body was too frail to withstand the transformation and she ended up dead. Lavinia has no idea any of this happened, since Harriet begged her to stay away until the transformation was over, too proud to be seen in such a weak state.