First off, current evil Queen Cersei May has long-ago locked herself in the Palace of Westminster declaring that Winter has arrived. Fearful of an army of undead socialists who have come back from the 1970's, she has instead seen her own army desert and sits lonely, waiting for the inevitable last stand.
To challenge, May comes the pretender Farage-Stark. Farage has mustered the Men of the North to fight both Queen Cersei, The Undead Socalists and the EU Emperor Junker. Whilst Farage has painted himself as loyal only to Westeros, he is in fact not even Northern, but a treacherous court minister, now turned rabble rouser. With a strong army, he advances towards the EU city of Brussels (Stasbourg on Tuesdays & Wednesdays) and then has set his sights on May's Palace at Westminster. With a touch but small army, he is likely to over-reach.
Next in line and keen on the Westeros throne, is Socialist Prophet and King of the Undead , Jezziah. Turfed out of his stately mansion in Islington and brought back to life from the pre-millennium period, Jezziah leads an army of Momentum Zombies who wish to make Westeros fair for all by levelling the whole place to the ground. With little strategy but enormous forces, Jezziah plunges on, heading for Westminster and trying to ignore Farage-Stark and refusing to entreat with the EU who he later plans also to destroy.
Returning in a frankly bizarre plot-twist is the High Cable, preaching peace to everyone as the expense of all Liberty and Democracy, he has gained an unexpected following as urban people revolt in protest against the Pretender, Queen May and the army of the Undead. Can't see it lasting and I bet the Urban types all get killed in the end. It would be better if he joined with some of the smaller characters but he is too old to do much.
The real winner of the series so far seems to be the made Lord of Dragons, Guy 'Daenyrs' Verhofstadt. He has long held that Westeros must be destroyed and won't even participate in the elections. Along with Lord Junker and Ser Michael Barnier, they seek to burn Westeros and claim it in the name of the EU. Never nice when the baddies win a season, but it is hard to see currently how the divided leaders of Westeros could unite to face the EU Dragons?
This covers the main characters but there are a few minor ones too that have developed:
A new group lead by Chuka Reek, seeks to betray all around and seize power for the old Lord of Blair religion. However, he has become quite a comedy character as everything goes wrong and the small rebellion he leads seems destined to be crushed and forgotten by one or all of the main leaders.
Also now departed by interesting was Tommy 'Bolton' Robinson, a nasty piece of work who thought he could win around a decent following by threating and scaring all he came across. Not really enough support for this approach and his character has long since departed the stage.
