My prefix used to levitate a ball
When he was just a lowly youth, and small.
A lowercase "i" appears to have a ball hovering above it.
His friends are not con, but surely quite pro.
I is a pronoun
Also, "Aye" is used to indicate agreement - pro and not con.
He's rarely an object, just so you know.
"I" is typically the subject of a sentence, not the object.
My infix will happily take your place,
"I" is a word you use to refer to yourself.
And sounds like something that is on your face.
"I" sounds like "eye."
Of terrible storms, she's sometimes a part,
The "eye" of the storm.
Yet always has your best interest at heart.
"I" always have my own best interests at heart. (Or is this a play on the letter I being used to represent interest in financial mathematics?)
My suffix shrinks you way down to just one,
"I" is the Roman numeral for one.
Also, no matter how many letters are in your name, using the word I in place of your name shrinks the number of letters needed down to just one.
And can be dodgy if left with the sun.
Your "eye" evades the sun's brightness with hats or sunglasses.
While comfy with friends, she can stand alone.
"I" is found in many words, but can also stand alone as its own word.
She is your friend, but she's not in your phone.
You typically don't have yourself as a contact in your phone?
And the title hints that since the word is only a single character, the prefix, infix and suffix all overlap - they are all just the letter I.
