Brizo is another goddess of the oceans, but also the protector of the fishermen and anything related to fishing. She dwells in any ocean Greece has to offer, and can breathe underwater. She is not a mermaid or siren, but she was spotted long ago by some nearby mortal fishers, and they mistakened her for a monster because of her scaly legs and body, therefore meaning that she does not wear clothes, and is nude.
Brizo being alone all the time, her only friend is the ocean. She hasn't spoken to anyone for a long time, and misses that feeling. So she might have lost the ability to talk to others properly and be well-mannered.