* John Pym: A leading member of the Long Parliament and one of the architects of the English Civil War.
* Oliver Cromwell: A prominent military commander and later Lord Protector of England.
* Edward Montagu, 2nd Earl of Manchester: A Parliamentarian general and later Speaker of the House of Lords.
* William Waller: A Parliamentarian general who fought in several major battles during the war.
* Thomas Fairfax, 3rd Lord Fairfax of Cameron: A Parliamentarian general who commanded the New Model Army.
The Royalists:
* King Charles I: The reigning monarch of England during the English Civil War.
* Prince Rupert of the Rhine: The king's nephew and a leading Royalist cavalry commander.
* James Butler, 1st Duke of Ormonde: A Royalist general and Lord Lieutenant of Ireland.
* Edward Hyde, 1st Earl of Clarendon: A Royalist statesman and historian who served as Lord Chancellor during the reign of Charles II.
* George Goring, Lord Goring: A Royalist general who fought in several major battles during the war.
Others:
* The Scots Covenanters: A group of Scottish Presbyterians who allied with the Parliamentarians in the English Civil War.
* The Irish Confederates: A group of Irish Catholics who fought for greater autonomy from England during the war.
* The Levellers: A radical political movement that emerged during the war and advocated for universal suffrage and other democratic reforms.
* The Diggers: A group of religious radicals who believed in common ownership of land and practiced communal living.