Its Not But Its The Design So - Tumblr Posts
Species Swap-ish AU

Basically in this AU, Garmadon got those recessive genes or smth. Kinda like canon Lloyd, who hasn't showcased any oni-dragon traits until crystalized, Garmadon doesn't have any major traits from those species. The great devourer still bites Garmadon but because he doesn't have the correct genes/dna(idk)like in canon, the 'evil' only manages to make him a little more violent when he's angry and turn his eyes red.
(Maybe the venom ends up helping him shift between his human AND oni form...but Garm doesn't know that yet. Hah, the Overlords plan backfires.)
Nothing more, and he can control the anger pretty well, so yay happy ending instead of being banished by Wu to the underworld for so and so years. As for Lloyd when he's born, THATS ANOTHER LEVEL. All those oni-dragon traits meant for Garmadon is instead passed down to Lloyd via heredity-hence the technically species swap of this AU between them.
His baby teeth are growing sharp, he has oni horns and a oni-dragon tail mix. His eyes also turn red like Garmadon's when he's angry. Lloyd will also be able to poof four arms and wings when he's older but for now HE'S A FERAL CHILD.
Poor normal-ish Garm has to wrangle a chaotic Lloyd around, stop him from accidentally destroying everything with his destruction powers and from fucking BITING people. Garmadon's one of the only people that can make his son calm because Lloyd loves his dad to pieces(and vice versa, lloyd means the world to garm)
Aka adventures of garmadad raising a chaotic dragon oni hybrid lloyd while simultaneously being the best father ever.
Lloyd: Setting stuff on fire with purple flames.
Garmadon, sleep deprived: Oh father, not again.