Add the stock to a pan and add in the kombu and fish sauce. Bring to a simmer. and cook on low for 20 minutes as you prep everything else.
Get a large pan over medium high heat. Add in the mushrooms and onions and cook about 8-10 minutes to soften and drastically reduce in size.
Add in the and stir to combine. Cook 3 minutes. Add in the garlic and cook and stir for 2 minutes. Then add the kimchi and gochujang and stir and cook another 5.
Remove the kombu from the stock and add a ladle of the stock to the rice.
Stir the rice and continue to stir fairly often, adding another ladle of the stock every time it gets a little dry. This process should take about 40 minutes until the rice is tender. If you run out of stock you can finish with water.
This is a good time to pop the chicken into the oven at the lowest temp you can do, so that you can serve it hot on the risotto.
When the rice is about tender, add in the tofu. I just cut it roughly in the container it comes in and dumped it in. It will break up more as you stir. Also add the gochugaru.
Continue to stir until the rice is ready.
Serve the risotto in a shallow bowl and top with the chicken. Garnish with scallion, sesame oil, and gochugaru.