So, we have the first gods, who made the titans, who made the gigas, who made the giants.
We have statted versions of the Hell and Abyssal gigas. We have mentions of the Maelstrom and Nirvana gigas.
So, what more to the gigas is there? Elysian, Boneyard, Axis, or Abadon? Are we limited to outer planes for gigas sources, or could there be a fire gigas, an entropic gigas, or even a material plane gigas?
Any and all ideas are welcome (especially from any developers who might want to hint at upcoming books!). I've got a plot line involving a storm giant "ascending" to gigas status that I want to develop more aggressively within one of my games.