Place aduki and cannellini beans in a large bowl and cover with at least 2 cups water. Place black beans a separate bowl and cover with at least one cup water. Soak for 4-8 hours (or overnight, if possible). Drain the beans and rinse thoroughly.
Place the black beans in a large stock pot and add the vegetable broth and kombu. Bring to a boil, reduce heat and simmer for 20 minutes.
Add the aduki and cannellini beans and simmer for another 60-90 minutes, until all beans are tender. While beans are cooking, add olive oil to a medium sauté pan. Dice the yellow onion and add to the pan. Sauté until translucent, remove from heat.
When the beans finish cooking, remove the kombu and transfer the onions into the stock pot with the beans. Add the red quinoa, diced tomatoes, green chilies, and spices. Turn heat to low and simmer for 30 - 40 minutes (add water as needed). Add frozen corn and continue to simmer for another 10 minutes.