He is a white tiger with dark gray stripes and whiskers. He has pink around his eyes, and is often seen glaring. The inside of his ears are light blue, which are the same shade as the Bubble Shirt he wears prior to New Horizons. His appearance is most likely a reference to albino tigers, which are one of the most well-known albino animals.
Below is a brief description of the cranky personality. For more information, click here.
Cranky villagers will usually appear in a grouchy or agitated mood and are more difficult to befriend than most other villager types. When talking to the player, cranky villagers tend to become angry if the player disagrees with them or refuses to do a favor. Like all cranky villagers, Rolf will be invested in his hobby and will often challenge the player to various competitions. He will easily get along with jock, snooty and other cranky villagers, and occasionally lazy and normal villagers as well. However, he will find it hard to socialize with peppy villagers, as they will seem overstimulated or immature. Rolf will also enjoy spreading rumors about other villagers.
In Wild World and City Folk, he has a metal/rock themed house with two Bowtoids and plays the song Rockin' K.K. in his house on a gold stereo. He has a manhole, a mini bowtoid and a modern bed.
In New Leaf, his house is more of an outdoor tent, with exercise and training gear scattered around. He uses the Blue tarp as wallpaper and the Sandlot as flooring. He now has Spring Blossoms playing on his tape deck.
In New Horizons, Rolf's home now appears to be a mountain base camp, due to his furniture and choice of wallpaper and flooring, which are the Summit Wall and Flowing-river flooring. Centered along the back wall of his room is a Wild log bench, surrounded by an Old-fashioned washtub, Simple DIY workbench, Sleeping bag, Portable radio, and a Stone stool with a Lantern perched on top of it. The lower-left corner of his room has a cooking setup with some Firewood, Campfire cookware, and a Camp stove.
Rolf is one athletic tiger. He's probably in such good shape because he grew up on a snowy mountainside. Running up and down steep inclines in sub-zero temperatures has a way of toning your muscles in a hurry!