James Holden: Anarcho-Syndicalist. Hates authority figures, is a staunch proponent of illegalism, organizes his crew into a sort of democratic worker co-op, is naive but not entirely to a fault and a wholesome idealist.
Alex Kamal: Just wants to grill.
Bobby Draper: Part of a soviet-esque military vanguard, a true committed revolutionary.
Naomi Nagata: While the OPA is draped in anarchist aesthetics in the text they also share a semblance to Maoist third worldist and anti-colonial movements.
Amos Burton: Crust punk anarchist, kicks in reactionaries' skulls and defends sex workers and his lgbt comrades claims to be unconcerned with "politics" but would definitely fall on the right side of a revolution.
The first couple seasons are a bit rough around the edges but it's worth sticking it out. And Holden has some great character development through the series.