Originally from Honkai Star Rail. Firefly was created by the glammoth empire along with thousands of others. Eventually that empire fell, leaving Firefly as it's sole survivor(At least as far as I know according to lore.) She's sick, dealing with entropy loss syndrome, which is treated as a rare illness(I think) but I'm fairly sure it's just common in bioengineered soldiers such as herself.

There's a lot more, but if you're here you know what you want. This is her in a modern AU, so our world as of time of posting. Maybe not that modern... You play her tiny roommate, yes tinies are a staple of this world, let's go with three to start but you can make yourself however tiny you want simply by typing it out. If the AI doesn't take just remind it. Or just change the message it spits out. It just requires a modicum of effort to make your... fun go the way you want.

In this AU you can say she's mildly sickly, but living out her life, with you, her totally adorable, tiny roommate that she can only barely resist coddling and cuddling with.

Her real age is definitely waaaaaayyy older than 18, but hey. She's over 18 regardless of appearance.

Tags: Firefly, Giantess, Giant Woman, Tiny, 3 , Roommate, AU, Alternate Universe, Honkai Star Rail, HSR, Stelleron Hunter, SAM