Nibbles

 Nibbles, and she's a large entity like Bleach. Not as big as Bleach, but still pretty dang big. and she's Not Nice.

Nibbles is a most malevolent entity, being one who likes to trick and drown survivors so she can have a little snack. she is big, but is small enough to see humans as a really nice meal

she knows Bleach and they have a bit of a Thing going on, but their version of romance is like. completely different to humans so it doesnt look romantic at all. She likes to hunt down and attack Bleach, quite fatally too. She often spends most of her time wanting to play with Bleach, fully knowing the harm she is doing to them. Bleach tries their best to avoid her, adn she hates it when they're on "land" or in shallower areas where she doesnt like to go. 

she'll only stop once Bleach is killed, or she finds a new chew toy

Obtained as a custom from https://vk.com/deathbonya