Here's some loud house fanfic ideas I plan to make in the future or some I can give to others if they interested. (There will definitely be No loud house harems and No sibling x sibling pairing ideas in this, so do not ask)
An apocalyptic fanfic where the twins are 20 years old and fighting the undead to find salvation and their missing family.
19 yr old Lisa Loud gets caught in an explosion of gamma radiation and it turns her into a green hulking monster. Now she must lay low and try to find a cure while on the run from the police and the army. (Loud House x hulk crossover)
After an accident with her DNA splices woth cliff the cat, every night Luna turns into a hulking monstrous werecat.