Engels: silly VNs like monster prom, friendslop games, very casual and easy social games you can chatter over
Marx: Victoria 2/3, The Stanley Parable, SOMA, Disco Elysium, thinky thinky games, anything with good worldbuilding and story.
Lenin: Victoria 2/3, any games with great classical style soundtracks. Probably wouldn't play it for the game but just turn it on for the music. Like the nier games, expedition 33, the velvet room in the persona games, etc.
Stalin: forced to play HOI4 with mods by his friends. Wants to play games like stardew Valley, slime rancher, and other comfy games. Occasionally plays Workers & Resources: Soviet Republic to get the economy bone out of him because he doesn't want to get dragged into Vicky with the others.
Trotsky: acts like he doesn't play games but enjoys extremely horny VNs on the down low.
Mao: CK3 playing as a peasant trying to overthrow the Tang Dynasty and become the new emperor
Che: final fantasy games. Anything that has 'friendship Is magic' heroic idealism
Fidel: those EA sports games, Dave the Diver, subnautica
Kim Il-sung: The Sims, peaceful colony builders.
sorry