Eru wouldn't necessarily have to take on a physical form to appear fair or terrible. Sometimes looking at a person's expression is the only way to tell what they are thinking, but in some cases, you don't need expression. For example, look at a flame. There is a very big difference between a small, cozy, campfire and a huge, raging forest fire. I think Eru is kind of like that. His "aura" changes depending on how he feels. I have always imagined him as being a "naked flame" since the Sil says that unclothed, the Ainur were like naked flames (so I'm assuming something of the same applies to Eru).
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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