"It's over here"

Could you tell me what function over has in the sentence? Is just saying "It' here" unnatural in the context? Thanks in advance!

The line is quoted from
at 03:27
The transcription is in http://mlp.wikia.com/wiki/Transcripts/Friendship_is_Magic,_part_1
Could anyone help me?
over is added to many expressions of place and verbs of motion without adding a great deal of meaning.

over here, over there, over to him, over to her, over from there

go over, come over, move over, cross over, run over, walk over

I would say that "over" emphasizes the trajectory and the distance to be traversed.
Come (from there by moving) over (to) here.

When you say It's over here, you are suggesting that the other person would have to move 'over' to where you are.

"on" is also used in these expressions to add encouragement. While "over" emphasizes the trajectory, "here" or "there" emphasizes the destination. "come" and "go" are hardly ever used 'bare' compared to all the other variants.

come here, come over here,
come on, come on over,
come on here, come on over here,

go there, go over there,
go on, go on over,
go on there, go on over there

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Thank you very much CJ! So only when the you are near the hearer, you can say "It's here"?
PonyFanSo only when the you are near the hearer, you can say "It's here"?
No. It works more like this:

Speaker and hearer close together: "It's here".
Speaker and hearer not so close together: "It's here" or "It's over here".