I suggest you make character profiles with key ideas and quotes for each person. Also, mind-map themes on a poster. It's a good idea for any subject to make posters and stick them somewhere you will see them - our teachers recommended the back of the bathroom door but I stuck mine on my mirror so that when I brushed my hair every morning I could read through the facts. It did make me realise how often I look in the mirror, but I had an excuse if I was revising! The outside of the shower door works too; it's a bit weird, but you can revise through the glass.