Rolf confuses the rest of the kids with his unusual customs and food-making. He is one of the few characters who gets respect from all the kids, but his best friend is Kevin, and relates well with Jonny, being an outsider too. He is also exceptionally hairy, and although he has not revealed his age, he claims the hair is premature. He has a strong liking for meat and when he agreed to a bet to not eat meat for a whole day, he became extremely malnourished and had severely lost his muscle tone almost instantly, not even having enough strength to open the cafeteria door or bite through celery. Nobody except himself and his family knows what country he is from, but as every single thing that's linked to him is known, he is most likely from Eastern Europe, however this country he comes from is apparently fictional.
Hailing from an unknown country presumably located somewhere in eastern Europe, Rolf is a hard working, jolly, fun loving, friendly, but also fearsome and strange character who has the respect from almost everyone in the Cul-De-Sac.
Rolf values hard work and most often he can be found working on his parents' small farm, doing all sorts of chores, from the menial, ordinary chores, such as tending to the animals, planting seeds etc, to the downright strange. It is because of this frequent display of labor that Rolf has strength that rivals Ed's, though his strength, while impressive, is no match for Ed's, as Rolf can only use when he is angry, while Ed's strength is a part of his biology. Even though he often works, and takes great pride in his achievements, he describes his youth, back in The Old Country as being "lazy - good for nothing" and it is possible that he does some of the chores out of fear, as he once mentioned, that if his chores are not finished, he will be "banished to the cupboard". This is one of the reasons the Urban Rangers exist, to do all sorts of chores around the Cul-De-Sac, and to "become the masters of the mundane" as Rolf puts it. They are a boy scout-type organization that has existed for over fifty years and they are specialists when it comes to chores, for which they earn badges. Aside from the menial chores, they often take camping trips to the woods in order to win camping badges.
Rolf has also numerous times shown a type of honor system, most notably in the episode "Dueling Eds". Of course, growing up listening to fantastic stories about heroes and battles, it is no wonder that Rolf grew up in to a man who gives credit where credit is due. Dishonoring someone from Rolf's country will result in a duel with dead fish as a weapons, while balancing on a tree above a deep chasm. If the man who has dishonored the other man falls down in to the chasm, the honor of the dishonored is restored, not just to him but to his ancestors as well, thus meaning that if just one member of a family has been shamed, dishonored or otherwise been disrespected, the credibility of the entire family is at stake, and this is so deep that it even has supernatural properties, was rigth after the "duel" begins, the alley was surrounded by heavy clouds that only vanished when Rolf (easily) defeated Eddy. The duel can be prevented beforehand if the one who has offended brings to the man he offended "The Cupcakes of Sorriness", and then they must accept "The Eels of Forgiveness" down their trousers. Rolf has claimed that those worthy of the most respect are village buffoons and barbers, which he aspires to be.
He is also a prideful person, taking pride in numerous things, most notably him being the son of a shepherd, his hard work and its achievements and him winning the covetous and difficult to earn the Urban Ranger Hairy Chest Of Resilience Badge. His pride in part might explain his illeism, that is, him referring to himself in third person, though this could also be as a result of his handling of the English language.
Rolf also seems to be the oldest child in the Cul-De-Sac and in some ways acts more maturely when compared the rest of the kids and in appearance (excluding the vast amount of body hair, which he claims to be premature). That is mostly because he grew up in a very different environment that the other kids, surrounded by a radically different lifestyle, etc.
Even though he is a hard working individual, he is also a fun loving person and when not working or hanging out with the rest of the kids, he can be found having a warm drink by the fireplace or having some candied beats or meat. His jollyness is best shown in the Season 3 episode "Wish You Were Ed" in which he is shown dancing to a particularly violent song called "That's My Horse" in which the two dancers say the line and than proceed to hit each other with their hands, or anything they can get their hands on (a barrel, a wheelbarrow etc). Despite it being very painful, Rolf and Ed enjoy it very much and Double D at one point even describes it as a "delightfully barbaric dance". He also owns an accordion, which the song is played on.
His many confusing customs have flabbergasted the rest of the Cul-De-Sac kids to no end. The many strange foods (fish balls and other assorted aquatic creatures and various meats), celebrations, activities and holidays (Yeshmiyek, kissing someone under a well fermented yak instead of a mistletoe in Christmas time, synchronized swimming, hanging and spinning upside down from a tire suspended by a long red and white striped pole etc), clothes (a vest made from his fathers back hair), stories (The battle between his Great Nano and a Giant Sea Cucumber) etc.
An odd thing about Rolf is that in Fa La La La Ed, he knows about Christmas like every one else, but in Ed Edd 'n Eddy's Jingle Jingle Jangle, he has no idea about Christmas.
Rolf has on numerous occasions shown his sorrow and longing for his Old Country, most prominently featured in the episode "Wish You Were Ed". Rolf is easily confused by the modern world and it's "cold cement, wasted steel of industry, confusing leisure delights" and the Cul-De-Sac's "customs" and that he "sweats himself to understand" our "modern go-go world" and often recalls his childhood days in The Old Country, his voyage to America in a canoe made from leather shoes, and he will talk for hours about his Great Nano. In the episode "A Town Called Ed" Rolf, in a way, seems to have accepted the "confusing leisure delights" and simply goes along with them. When Kevin invites him over to his house to watch monster trucks Rolf, somewhat nonchalantly, proclaims "Very well, Rolf will include himself once again in sharing yet another one of your menial customs and all the time wonder why". It might seem that Rolf has finally accepted his new, to him strange, home.