I'm sure "God" can look like anything he chooses even in Marvel comics,
but,
"God" has only chosen to take the form of Human writers and artists
that work for Marvel in the real world.
Even using names in the literal sense:
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Here's Roberto Sacasa (writer) appearing as what part of "God" is in Marvel.
(a writer ... and an artist as we saw in FF#511)
It's once again, fictional humanoid representations of real people.
I mean, even Joe Quesada (editor in-chief) is illustrated,
and depicted discussing the FF's future in their writing department:
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This is cool,
they convey the depiction as though the characters they give life to, are real:
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The writer imagines what will take place in the Marvelverse,
the artist then brings it to life on panel.
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This is a nice example of the "power," for lack of a better term, that TOAA has:
Sacasa decides to gives Reed the ability to "invent a tracking device that can scour the MultiverseS"
The Writer (TOAA) gave Reed Trans-Multiversal capabilities with a thought. 🙂
This isn't even "power" really being displayed by this "writer,"
it's inconsequential when categorizing it next to other stories/characters,
because they literally create everything that takes place on panel.
The writer/artist avatars are simply drawings in comics,
that represent the real writers/artists of the real world.
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PS. As we can all see, the top dog is the Editor in-Chief Joe Quesada,
but the Writer is the one that imagines what we read on panel,
and the artist is the one that gives that imagination life through illustrations.