I've been noticing a trend with twins in cartoons...
So there’s the more common identical (even if they’re fraternal they still look identical) sets like Phil and Lil from Rugrats, Mas y Menos
si podemos! from Teen Titans, Eska and Desna and Wing and Wei from Legend of Korra, Dave and Ping Pong and Chip and Skip from Camp Lazlo, Jim and Tim from Kim Possible etc. who are basically two halves of a whole and are rarely ever seen apart.
But if anyone ever strays from that stereotype, it’s almost always a boy and a girl (who still look pretty damn similar) who basically inverted versions of each other. The sister is the more adventurous, energetic, outgoing twin, while the boy is more quiet, shy, and nerdy/geeky, like Zak and Weezy from Dragon Tales, Mabel and Dipper from Gravity Falls, and Scooter and Skeeter from Muppet Babies. I get the importance of character foils, but jeez, mix it up a bit, people.
… And then there’s Dag and Norb. They’re their own category.
In conclusion, I may be slightly irked that they never make cool girl twins who I can relate to, and also I watch way too much TV.