My cereal is plain raw oatmeal every day. About 1 cup of quick oats or large flake, to which I add about a teaspoon or two of cinnamon if I have it, about 1tbsp of chia seeds, then add about a cup of frozen fruit, stir it all up, then I nuke it dry for about 1 minute to take the edge off of the frozen fruit a bit, then I add almond, cashew or coconut milk just to cover it and let it sit for 5-10 minutes to soak it up and let the chia gel a bit. Then I add more of the nut milk to fill it up like you would normal cereal. Occasionally I sprinkle some demerara on top if I feel it is needed.
If I'm out of cinnamon I will sometimes use 1-2tbsp of cocoa powder instead along with an appropriate amount of some kind of sweetener to make it chocolate, aiming for the least amount of sweet necessary without it being bitter. Also occasionally I will throw in nuts, seeds, coconut or other common baking ingredients from the bulk store just for variety. If I have dates or raisins or some other naturally quite sweet fruit, I may add more of that instead of any refined sugar products if it needs more sweetness. Most of the time whatever fruit I've chosen is sweet enough on its own though in the amounts I tend to use.
Nom nom nom, oatmeal with fruit!