Just finished watching all 5 series. Fantastic stuff, easily my favourite programme outside of Breaking Bad. Have to say though I don't think any of the series were as good as series 1. For me that series set everything up nicely, and since then it's actually been a little bit slow properly starting. I really thought series 5 would be when things start to happen, but it just took ages to get going, and by the time he did it was practically over. Brilliant show though, cannot wait for series 6. My favourite character is actually Daenerys Targaryen. I watched each series expecting her to march on Kings Landing at some point in each one, but disappointingly she hasn't yet, and considering the situation she was in at the end of the last episode it doesn't look like she will in series 6 either, when it feels like it's been building up to it for a long time. Love Tyrion as well, Dinklage is a fantastic actor.
Predictions for series 6:
**Contains spoilers**
Lady Melisandre brings Jon Snow back to life. Snow, Melisandre and Davos then leave the wall and at some point meet up with Theon and Sansa, as well as possibly Brienne.
Bran Stark will return, and will have a lot of power after being trained by the 3 eyed Raven. He will also be re-united with Jon and Sansa at some point.
The white walkers get over the wall killing whoever remains in the night's watch, as well as the Bolton's at castle black.
Bran will use his power to help stop the white walkers in some capacity.
The remaining Lannisters will hear that Tyrion is now in Meeren and will attempt to track him down and kill him.
Daenerys will eventually be rescued from her current predicament, and will march on Dorne.
Theon and Peter Baylish will die, as well as one of the big characters, such as Jamie Lannister.