darkSpyro

With every previous game, everything was revealed through datamining (believe that is the term). I know the companies who make the games frown on it, but hasn't anyone discovered all this mystery element stuff yet??

Yup, all that was revealed right after the release. I think the user here Kung Fu Man revealed it all.

Through datamining, the mystery elements are Light and Dark.

The Light Trap Master is Knight Light and the Dark Trap Master is Knight Mare.

The Light Skylander is Spotlight and the Dark Skylander is Blackout.

<-this

Yes, he revealed some of his findings, but also kept some of it secret.

Basically, the mystery is two new elements: Light and Dark. Each has a Trap Master, a Core, 3 Traps, 4 Villains and an Adventure Pack. The Adventure Levels each contains the major villain of the same element, while the remaining "Mystery Villains" can be found in the Main Story (except the Light Villain 'Lob Goblin', who is in the Nightmare Express Level).

The two cores are both dragons (should be expected, since every other element got a dragon in the first game) - the Light dragon is female, while the Dark dragon is male. The two Trap Masters are both knights - a female centaur for Dark and a male angelic humanoid (I wouldn't call him a straight up angel, due to his strange head) for Light.

The Dark Doom Raider is Nightshade.
Does anyone know the name of the Light Doom Raider?

Luminous.

^ Thanks