Take a handful of main characters from your recent fantasy reads and think hard about how you would describe their personality.
For many of my favourite books I could wax lyrical about the main characters, but for many popular works of fantasy (some of which I enjoyed) I find that there is less to say.
The fact is that the genre loves a generican hero. For many main characters what we remember is what they did, not who they were. Our list of things to say about their character is often:
ii) Tries to do the right thing.
Writers like George RR Martin and Robin Hobb give us real people with deep and believable personalities. Others (and I'm not saying the books are bad) give us a two-legged vehicle designed to exercise the plot and into whose shoes we can imagine ourselves.
The art is to write real and uniquely interesting characters but to bring to the fore enough of their common humanity that the reader can bond with them, care about them, laugh, suffer, and fear with them. And that's a hard art to master.