If you are familiar with El Goonish Shive, then you can liken me the most to Ellen, except a little older and having blue-hazel eyes instead of brown. 5'6", athletic in the runner's sense of the word. Long limbs, hair is medium-long and wavy. I'm bubbly and most always happy, unless a friend is in danger or in pain. I always like to help people, but I'm bad when it comes to hard manual labor. Last and most important piece of info: I'm a Bible-believing Christ follower and stick true to the Word.
I've recently become obsessed with the Kingdom Hearts series, particularly KH2!Riku, and in the future plan to get a PS2 to play the games again, writing a fanfic, and making a fandub. The fanfiction is called Sharing a Paopu, and can be found both on my deviantART page (which updates more frequently) and on Fanfiction.net.
The difference between mers and nixes is the ability to use elemental power. Nixes have the power to manipulate water to do what they need, and they can also assume a somewhat human form, which can be indistinguishable if they hide their ears well enough. Merpeople are kinda just there to be in the water, and this is just me, but I like basing mers off real aquatic creatures and my nixes just be whatever.
This is my view, at least. But all mers AND nixes should be anthro. No one should kill fishies just to attach their tails to a severed half-of-a-human.