The Celestials (Celestials Series)

The Celestials are a "Alien" located in the Fanfiction Series: "The Celestials Series", despite being considered Aliens by Ben and the Plumbers, Kevin however states that Humanity and anything in-between are the Aliens since The Celestials had a hand in the creation of most lifeforms.

Powers
The Celestials are a unique Race with some so old that they predate the Earth and even the Milky Way Galaxy while even the Oldest isn't old enough to remember the creation of the Universe itself, the Celestials defy Age and human biology despite the fact that they look alike to Anodites and to a less degree - Humans, Celestials have been proven to not need the Human necessity of Food, Water and Oxygen making them seem like an Anti-Existence or Gods.

Weakness
The Celestials have very few weaknesses, less so than the Anodites, their biggest weakness is possibly the fact that they cannot become an energy form like an Anodite but instead their body can regenerate, the biggest flaw that the Celestials have are that their energy can be used against them however it is incredibly difficult to do so.