I find that having character concepts from fiction/history help me understand what powers and abilities a subclass should have.
Somebody (idk if the name is in the legends) told Robin Hood that Sherwood Forest was a good place to hide out; that could be modelled in D&D as a Ranger.
Successful rebels need to keep finding safe places to hide, as The Authorities track down the old ones. Continuing employment for the Ranger, possibly several if you distinguish between 'city ranger' and 'wilderness ranger'.
King Saul (Bible) began as anointed by the God of Israel and eventually was possessed by a maddening spirit instead. He still could go out and fight the enemy, but his lieutenants (David, Jonathan) overshadowed his exploits. He could be mechanically portrayed as a Paladin who eventually takes levels in Warlock.
Have you heard of "Bill and Ted's Excellent Paladin Oath"? It is modelled after the Oath of the Ancients.
I do solemnly swear that I shall ...
* Be kind, yo, and fight against sadness
* Find places where people are cool dudes and shield them from the bogus ones
* Keep real chill and awesome, can't spread coolness without being cool yourself, dude
* Inspire others to be real cool and chill and thus spread the coolness
This might describe a wandering CG Paladin of Freedom who helps out where and as he can, until he decides to stick around and finish what he started.