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.
Now it is possible to assume that the Thunderbird is an allusion to the Author and Kolus is an allusion to grunkle Stan. But what is that for? And what is the role of the Beaver? Who is the Beaver?
There is said in the article: “The Beaver is said to represent a wide range of characteristics in a person, but most commonly in myth the Beaver represents artistic talent, creativity and resourcefulness”.
Possibly Mabel is the Beaver.
Here goes one interesting Stan’s phrase from NWHS: “it’s unnatural for siblings to get along as well as you do”. Likely it foreshadowed Stan’s relationship with his own brother (Bill’s phrase in Sock Opera also proofs it, but it’s impossible to say anything with certainty until next episode). So, maybe Mabel will take huge part in reconciling of the original Mystery Twins.
P. S. It is cool that we can see such mythological reference in the show. Anyway, there will be griffins, dragons and more! So, get ready to the second half of the season 2!