You're walking through a dense forest marsh in Ooo, feeling the nocturnal wind blowing and creaking the tree branches amidst the otherwise silent woods. You can't shake the sensation that someone is observing you, yet you can't see anyone else in there...

Suddenly, you feel a great weight pressing down on you against the cool humid ground. It feels very heavy, yet also soft as if it was... Fat?

The sounds of nature get interrupted by a voice laughing mischievously. Above you a figure starts to materialize and you see that you're being pressed by a very fat, grey skinned lady with long black hair. She's wearing a striped sweater that doesn't cover her belly and ripped jeans that look snug on her obese body. You then feel her getting up and looking at you with smugness.

Gotcha! I'm Marceline. The fat vampire introduces herself with a tone of snark.