If they were Dongbei dumplings, they’d primarily be pork and cabbage, or just cabbage. Those aren’t the only fillings, but those are the main fillings. The non-traditional in this case comes off more like vegetarian versions.
The tofu strips with pepper is very much a Dongbei-style dish. Even more so if it had small bits of pork with it. And the pork, the name speaks for itself.
I first had the pumpkin pancake at a Wuhan-style place, Tasty Dining in San Gabriel. The item is viewed as being Sichuan, because several of the newer Sichuan places serve them. I think its mainly because few had seen them until they had them at Sichuan Impression.