I can't imagine her being any cooler, so the score is the maximum. Even though she's not physically cute, she's extremely affectionate, which is why she got a good cuteness score. Even though there are several fan arts of her with big butt and curves, none of that is visible in the cartoon, so I rate her as having a normal girl's body. however, she has a nice voice, can shapeshift and has a long tongue, so she has a okay rate at the end. She still has a lot of potential unused.
Waifu Sommelier 2 - Marceline from Adventure Time