"those with a character" or "...the character"?



I'm working on a motivational quote for a picture I'm drawing.

"Persistence is a journey
for those with a character
to be what they are capable of."

The context: we see a well built swimmer from the top.

My only concern is "the character" or "a character"; and "be" or "become."
It's not suppose to be a quote which makes sense for a 3rd grader.

Also, could someone explain why the article would be "a" or "the"?
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