Welcome....the treehouse is the place to be if you want to learn about writing; be it Fantasy or even dabbling in SF. Some right friendly people here.
Writing should be fun even as it can be hard work at times, so you have that part down.
But as to the unicorn, the only significance is that She might be mean.
And if you see a group of armored space marines beam in be careful there too. They're not mean but they may not be paying attention.
You can see all types of interesting things here. Maybe a shorter girl with short bright red hair and a white mohawk usually wearing black and listening to techno or rav music. She has a friend that is a griffin whose wing she healed.
Or a taller, skinny young woman with long black hair that hides her pointed ears..some people think she's on the boring side but that can change. She dresses down usually unless she's on a date with her boy friend who legally cares a gun with him every where.
And I like SF and Fantasy too.