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1. Butters/Cartman)) For example, "Casa Bonita" (where Butters spent a week in a bunker because Cartman really wanted to go to the Mexican restaurant instead of him)), or "Marjorine" (where Butters danced on the table at a bachelorette party, and whose idea do you think it was to send him there?)). After watching these episodes, people kept looking at me on the bus for a few days. And let's not forget the robot boy! It seems awesome... in general, these two can make anyone smile.
2. Kyle/Cartman) Eternal rivalry. There's not much to say about it.
3. Randy Marsh) In some episodes, he was the life of the party. For example, "905 - The Losing Edge," where he started a fight during every baseball game Stan played (someone had to defend the team's honor, xDD), or an episode in season 12 about the global internet outage. If you haven't seen it, I highly recommend it.
Season 13 didn't really appeal to me overall... it was weak.
Season 14 seems to be better. I recently watched episodes 1405-1406... and it was great. The conclusion is that they brought back the old South Park, and that's a good thing