Well no offense to the Dwayne McDuffie but for a lot of the explanations he gave out for Ben 10 related stuff, I took them with a grain of salt. Some of stuff he said contradicted what came before it or seemed very strange even by Ben 10 standards. Not ripping on everything he said but a lot of it was hard to believe. Besides Derrick J Wyatt has come up with a lot of stuff that's rewriting what Dwayne had established.
So going back to NRG, he looks like he's made of energy because he has no black outline you'd expect to see on a solid object or person so this implies to me that he's made of energy, that and the fact that he looks a lot like 10,000 Volt Ghost from Scooby Doo. The intangibility kinda doesn't make sense to me because in Hot Stretch he cut open a machine before removing the core when if he had intangibility he could of gone through it and removed the core with no damage to the machine.
Well Ghostfreak could, he turned Ben intangible in Don't Be Afraid of the Dark.
Ok that's a good exception
That statement sort of bothered me, if energy beings don't have DNA then how did Verdona Tennyson manage to have kids ?
That's a good way of thinking, but there are a lot of new ideas that are pretty good in explaining stuff. I only choose to ignore things that don't make sense or changed what came before it like Kevin being a mutant who could manipulate energy to a half human alien who can cover himself in whatever material he touches and has limited shapeshifting.