Eon was created with the big bang, so he's kind of a big deal. He's known for controlling the Earth's axis and being responsible for certain natural phenomena on Earth. Needless to say, he's a fan of Earth and its creatures. Overall he's all about life. His job is to ensure that the universe is well enough to sustain life. I wonder how he feels about Thanos' plan in the Infinity War movie. Yes, half of all living creatures will be killed, but that will make room for more life. What a conundrum. I sort of have the answer!
Speaking of 'Infinity War,' in the comics (which, let's face it, have no bearing on anything in the cinematic world), Eon tells Captain Marv-ell to save the world from Thanos, which with a team of other heroes, he does. Don't worry about Avengers 4 spoilers. The movie is so different that Captain Marv-ell isn't even a dude.