Perhaps it would be beneficial to first explain what I mean by Left vs. Right. I'll make it real simple, and we'll disregard many social issues, we are looking strictly from an economy/government based version, as our social issues today are incomparable to many social issues of almost 2000 years ago. Therefore, the distinction I'll make between Left and Right is this: The Right believes in smaller government, the less, the better. The government should not be used to solve social problems, nor any other problems. And that the government should only be used for military purposes to defend their country. While the Left believes in bigger government, and that the government can be used to help solve social crisis among other thing.
Pei Kai is a great example of a man of the era who mirrors, at least, socialist tendencies. I draw this conclusion off of the Xinshuo Xinyu (which one must take with a grain of salt), in which Kai said, "To diminish excesses and supplement deficiencies is the Way of Heaven." This literally translates to redistributing wealth from the supremely wealthy and moving it to the more needy. In this policy alone, one can deduce Pei Kai would be left-leaning in today's cultures, because Pei Kai believed in the government, via taxes, to redistribute this wealth. (For context, according to the Xinshuo Xinyu, "Pei Kai each year requested from Sima Tong and Sima Lun, principalities a tax of several million cash (qian) in order to relieve the needy members on his mother's and father's sides of the family. Someone ridiculed him, saying, "How can you beg from others to perform an act of private charity?"To which he responded with the above, 'To diminish excesses...' ")
I believe Du Yu is a prime example of an official who supports Right leaning, libertarianistic viewpoints. I believe so as a result of a memorial taken from the ZZTJ,
Mostly taken from the first paragraph, Yu makes the point that laws are effectively pointless in determining good or bad, and rather one had to go off their "heart." Not only does he talk down upon the meaninglessness of laws in the first paragraph, but again in the last when he says that any laws added to examining officials would be pointless because it would have already been demonstrated by action where the standards are set rather than by law.
Du Yu's memorial
Now, I don't believe Du Yu is a total libertarian, but at least when it came to the front of selecting officials, he essentially believed in no laws and only going by your own judgment based on reports of others and themselves to determine who is most qualified on a yearly basis and making adjustments accordingly. Du Yu could not be considered a hard libertarian - but based on his memorial, he likely believes in a minimal amount of laws and restrictions and believes on judging people on a case-by-case basis. One could also argue he was a conservative as well.
Perhaps a more closer example to a more libertarian figure of the time would be Ruan Ji and Wang Cheng, but especially Ruan Ji. Ruan Ji did not believe in customs or rites, and according to the Xinshou Xinyu (again, a spotty source but I tend to lean in believing Ruan Ji was not too far off in his mindset),
This certainly sounds interesting to say the least, especially the latter half which gave me a good chuckle, but I'm going to focus on the more realistic side of it from the first half, which said many in the circle which Wang Cheng and Ruan Ji were in believed giving in to their impulses was true freedom. This is a ton of speculation on my end, but I'm willing to make that leap. By "giving into their impulses as true freedom" - this means a variety of things including murder, lust for others and yourself, and other, what I would call, "barbaric" tendencies. From this, I can judge that Ruan Ji and the circle likely were not fond of laws at all - perhaps even the closest thing to a full on Libertarian there was. But again, this is taken from a book whose word cannot be trusted fully, but also knowing for a fact the person who Ruan Ji is, a man who always goes against the grain seemingly and goes against traditions and taboos, I tend to believe this isn't far from the truth.Wang Cheng, Hu-wu Fu-zhi, and their circle all considered giving rein to their impulses to be "freedom" (da) (1), and there were even some among them who went naked....
Toward the end of the Wei Kingdom, Ruan Ji, in his fondness for wine, let himself go completely. Baring his head and letting his hair loose, he would set with his legs sprawled apart, completely naked. After him his disciples who valued "free wandering" -- people like Ruan Ji, Wang Cheng, Xie Kun, and Hu-wu Fu-zhi -- all carried on the tradition founded by Ruan Ji, claiming they had attained the root of the Great Way. So they doffed kerchief and cap, stripped off their clothes and exposed their foul ugliness like so many birds or beasts.