兰迪·马什看上去是一名真正的自由主义者，他时常为巨大的改变而斗争，不过在遇到严重问题、产生痴迷、感到误解的时候，他还是会变为保守派。His liberalism is first seen in "Spontaneous Combustion", when he tells the people of South Park that they have to fart all the time in order to avoid being burned alive. He was also shown to support the people of the future in "Goobacks", and thinks of them just as normal people. He even grounds Stan for calling these people Goobacks in a fast food restaurant, but his grounding was lifted after Randy loses his job to one of those people from the future. In "About Last Night..." Randy's political views are confirmed after he is seen supporting Obama. In "Member Berries", he strongly supported Hillary Clinton's run for presidency but made it clear this was an unusual occurrence and was only supporting her because of his dislike of Herbert Garrison.
As of The Damned, he is now supporting Herbert Garrisons run for presidency
As first seen in "Two Guys Naked in a Hot Tub", Randy has a very unhealthy addiction to masturbation. He often masturbates without thinking straight and becomes obsessive on whatever he is masturbating on. In the episode "Scott Tenorman Must Die", he was watching Mrs. Tenorman take her bra off. Later, in "Over Logging", he sneaks in the room where the internet is hidden then goes on it and starts looking at unusual pornographic material. In "Crème Fraiche", he was beating it to cooking shows. This soon became an obsession and it forced Sharon to give Randy an "old fashioned" in order to end his obsession and save their marriage.
Randy and his "disease" of alcoholism In "The Red Badge of Gayness", "Clubhouses", and "The Losing Edge", it was hinted that Randy has a drinking problem. Cartman also mentioned it in the episode "Grey Dawn", at one point stating, "Looks like Stan's dad's been hitting the bottle again." His problem was more closely examined in "Bloody Mary" after he was pulled over for suspicious of drunk driving. He got a DUI and his driver's license was suspended. The judge made him go around schools including South Park Elementary to explain to kids why heavy drinking is bad, and sentenced him to 2 weeks of Alcoholics Anonymous meetings. As a result of the A.A meetings, Randy misunderstands the concept of alcoholism and believes that only spirituality can cure him of this. He has been depicted as everything from a casual drinker to a heavy alcoholic. He still isn't as bad as Kenny's father, Stuart McCormick, as, unlike the latter, he is sober most of the time. He also had a job until he got himself fired in "About Last Night..." for a drunken tirade directed toward his boss. (It was revealed, though, that he was re-hired as a geologist in "You Have 0 Friends"). It appears Randy Marsh is a binge drinker - one who stays most of the time sober but drinks heavily at suitable instances. He might have a family history of alcoholism because his son Stan was seen getting drunk in order to avoid his cynicism in "You're Getting Old". It may be that Randy had the same problem Stan had and that Randy was constantly drinking to avoid hallucinating and seeing the entire world as a huge mass of excrement. This might mean that Randy was also diagnosed with cynicism and that his immature and dumb behavior might have been caused by the side effect of the alcohol he was consuming to cure him of his cynicism.
He was shown to still have a drinking problem in Freemium Isn't Free and Stunning and Brave although he denied this in both cases.
He appears to be extremely drawn to marijuana, going as far as to intentionally giving himself cancer just so he could get his hands on legal marijuana. He tried many ways to get cancer, such as smoking, getting a tan, and attaching cell phones to his face. He eventually came up with the idea of sticking his testicles in a microwave, as seen in "Medicinal Fried Chicken", just to get weed. Ten other men, including Jimbo and Ned, soon follow Randy's example.
Despite being drawn to marijuana in aforementioned episode, he seems to display some level of contempt for it in "My Future Self n' Me", as not only do he and Sharon hire someone to scare Stan from drugs, he also is the one to defame marijuana at the end. However, it's possible Randy simply does not want Stan to end up like himself.
It appears Randy Marsh is very musically talented. He is a good singer and he can play guitar really well as seen in "Guitar Queer-O" and "Over Logging". He also sung and played the guitar in "You're Getting Old", but this was not a display of good talent.
In "Something You Can Do with Your Finger", it's revealed that Randy was part of a boy band in the 1980s called "The Ghetto Avenue Boys." His group was successful for a few years, but he and the other members were quickly replaced due to getting "too old."
Randy began performing again in "You're Getting Old", presumably out of a midlife crises but quit because it was casing trouble in his marriage. He performed "tween wave" in Mick's Bowling under the stage name Steamy Ray Vaughn.
As shown in "The Cissy", he eventually achieved success as Lorde, although in this case it was due to his voice being changed with computers although it was implied in "Handicar" that he also plays guitar in Lorde's music. He eventually ended his music career in "#HappyHolograms", after an embarrassing live performance at The Pepsi Center and becoming disillusioned with the music industry and their use of holograms.