Honestly, I'm genuinely surprised that Cartman isn't the bicycle of the South Park Fandom and that the ships involving him aren't as enjoyed as other ships.
Don't get me wrong ! I love Creek and Stendy, and I believe they are popular in their own rights; I just find it weird that ships with Cartman aren't nearly as popular as they could be, especially considering the fact that almost every prominent character has material and a bit of chemistry with him in the show.
-Cartman's rivalry with Kyle and their complex frenemies/love-hate dynamic with intense interactions due to often conflicting morals and ideals, which is the base of many episodes. The fact that their very identities are complete opposite from one another, but they still share similar key traits such as being stubborn, egotistical, and driven. Their mutual obsession and the odd codependent nature of their relationship where they just have to one up the other. The constant back and forth where Kyle wants Cartman to change and become a better person, while Cartman wants to break Kyle and prove he is just as bad, if not worse than him. Of course, let's not forget that on the occasions where they do team up towards a common goal and set aside their differences, they work efficiently together. Moreover, they get along surprisingly well when they simply hang out and there is no clashing beliefs or morally charged disagreements. But what makes this ship truly interesting is that despite everything, it has been shown multiple times that they still care for each other, which adds even more nuance to their overall dynamic.
-His evolving relationship with Butters, that started off as extremely harmful and one-sided, is now a more balanced friendship. Butters, who is nice to everyone in general, is especially nice to Cartman and seems to hold him in high regards not just because/in spite of being afraid of him. He is more likely to choose Cartman's side every time there is a conflict and often provides unconditional support. As for Cartman, he has stopped tormenting Butters and he is even nice to him on some occasions due to Butters' loyalty. Furthermore, it has been shown that Cartman confides in Butters, which indicates a certain level of trust on his end, cementing that Butters is a close friend he can rely on. Of course their relationship is still far from perfect, but Butters isn't as naive anymore; he is now familiar with Cartman's cruel nature, having been personally subjected to it. Butters will stand up to Cartman when he reaches his limits and openly express his frustration at times because he no longer blindly chases after his approval. Nevertheless, he still sticks around and helps Cartman because he does care about him.
-Kenny being Cartman's best friend and arguably the one who understands him the most out of anyone in the gang due to their similarities like having the same humor, which usually makes Kenny go along with Cartman's antics, and the same interests (anime, video games, horror movies). The fact that they both have dysfunctional households (Kenny's troubled home with parents who always fight, and Cartman being the son of a neglectful single mother); as well as the fact they're both outcasts because Kenny is poor and Cartman is fat (poor, fatherless, his mom is a whore-) which are all things they can bond over. The occasional rivalry they have (the coon), though not as intense as the one between Kyle and Cartman, is still entertaining. How the show sometime hints at Cartman being aware of Kenny's multiple deaths and immortality (more consistently than other characters like Stan or Kyle, mind you) which adds more potential to their dynamic. Their mutual care for one another albeit in an unconventional way. Adding to all of that is how their relationship has its highs and lows, but they still ultimately remain close friends.
-The fact that Stan is one, if not the only person, Cartman is ever consistently nice to; while he may rip on him for having a crush on Wendy and for being too sensitive at times, it's never truly mean spirited more than it is to tease him. Most of the animosity he showcases towards Stan stems from him, more often than not, siding with Kyle during disagreements as Kyle is the most "reasonable" between the two. More proof of that would be how Cartman will sometime go out of his way to help Stan out when he is distressed, without any ulterior motives or grand agenda whatsoever. He will also encourage Stan when the latter forms his own opinion and acts on his own accord, all while disregarding others' expectations. Of course, this is all only when Stan isn't getting in his way—because it's still Cartman we're talking about—but even then, it's apparent that he likes Stan, even if the other doesn't seem to particularly like him. They do have moments, though, where Stan seems to genuinely enjoy Cartman's company when the other kids aren't around. All in all, their dynamic is just as compelling as the others to explore.
-The episode where Wendy has a crush on Cartman and kisses him. That episode clearly shows they can get along when they work together and that Wendy can find him attractive. However, their overall relationship throughout the show is tense and antagonistic; Wendy is not scared to call him out and put him in his place for what she thinks is just, that alone makes her stand out to Cartman because she doesn't match the image he has of girls (His passive mom, other girls at school who'd rather just ignore him, the girls in the media he consumes etc.). While he usually dismisses Wendy or makes fun of her, he does feel intimidated by her, as shown in the episode where she beats him up. Cartman seems especially mean to Wendy since he dislikes being so openly criticized, especially by a girl. However, it can also be inferred that he respects her even if it's in his own twisted way. As for Wendy ? Well, she is frustrated with him mainly due to his obnoxious and bigoted behaviour, but doesn't harbour personal hatred towards him like Kyle. The implications and potential of their dynamic are what makes the pairing interesting.
Obviously, there is also Cartman's entire relationship with Heidi before and after they started dating, which I don't think I even need to expand on as it was canon in the show and had its dynamic fully explored throughout season 20. All of this, despite Heidi not even being a recurring character as opposed to the ones I previously mentioned along with others like Craig, and his friends (Clyde, Tolkien, Jimmy, Tweek, etc.) which, by the way, I could go on and on about as well (shout out to people who shipped or still ship Cartman's rare pairs).
Clearly, Cartman is a very compelling character, and he has interacted with almost every kid in the show. There are people who have shipped characters for less (Dip, for example, which is also a ship I like, so I am part of those people), so why not ship him sometimes ?
It's understandable that some fans just don't like Cartman due to how much of a bad person he is, (he is supposed to be hated. Afterall, he represents so much of what is wrong in our society), so it would feel wrong for them to put him under any other light than "horrible bastard". Other fans are just not comfortable shipping him in general since he doesn't fit the usual aesthetic as he is fat (I would argue that doesn't necessarily make him ugly, but I digress).
I for one think it's okay to like Cartman and it's worth addressing that ships involving him deserve more love. Does this mean I condone his actions and agree with his problematic mindset? No. I like him in the realm of fiction only, and that doesn't stop me from exploring and playing around with his character in ways like shipping (whether romantic or platonic).
A ship isn't always "this would be so cute and nice, and it's totally canon!" Sometimes it's "This relationship is fascinating, and exploring it further would be really interesting." It's really fun too.
Got too deep there for a moment lol. Anyways, thanks for reading until the end if you're still here and have a nice day. I'm out !
