Here is the tail (no, this is not a misspelling) of two mermaids--what their adventures will be and where it will take them will be determined and discussed here.
Things to discuss and consider:
I think it would be interesting if the mermaids were able to shift into human form. It could add another realm to their adventures. We could add a time limit to their exposure to life on dry land--making it impossible for them to remain a land-lover.
I was also wondering if you wanted to make them peaceful creatures or predators?
Are you interested in adding romance into the story? I prefer to be female--but I am not against both of us being female and having a strong friendship instead. Or, we could make them from different parts of the sea and they are forced together, perhaps due to a storm, and despite their opposite personalities, they are trying to co-exist for a common purpose. (i.e. making it home).