Sounds just like my DD! She's now 3 and has a pantheon of imaginary friends -- Gaga, Koolalala, Kandandandan, and the unpronouncable (by adults) Glglllgllgl (sound made by rolling tongue in the side of the cheek) are the most frequent visitors.
Recently, they've started taking the blame when DD does something she's not supposed to... an inevitable (but still not thrilling) product of having imaginary friends!
She also bases some play off some games and movies she's watched. This is something to be careful about, my reading indicates though that it's when they ONLY play based off of movies, only recreate movie scenes, etc, that it's a concern. But it's perfectly normal for them to go through 'obsessions' where EVERYTHING is that movie or that game or that idea for a week or 2 or 3... then it switches to a new obsession.
DD also does imaginative play based on other events in real life. She loves playing 'store', for instance. Sometimes she's the shopper, sometimes she's the "pay lady". The role-playing she does -- and makes us do -- is quite intense and detailed!
We're reasonably sure DD is gifted, though not profoundly so. She knows all her letter sounds, reads a few simple words, counts easily past ten, knew all her colours and shapes before age 2, etc -- but she's not like memorizing the times tables yet lol...
She's also VERY empathetic. She plays imaginatively with her dolls all the time, soothing them when they're hurt, helping them go to sleep, hugging them when they cry, all in her imagination. When her older brother is upset, she tries to figure out how to help him. She loves to bring us snacks and drinks and is such a sweetheart.
We also let her play a-la "free range" most of the day. We don't structure much for her, or helicopter over her much either. She's got a lot of freedom, and she fills her time with remarkably interesting things.