Chapter: Fanfic ?? Yes or no? (Important, please read)

Hi first, I'm new here and would like to ask if I should write a fanfic about the following topic:
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Trash is a girl who is 14 years old.
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She has rich parents and, like Videl, catches criminals.
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[FYI, Trash is Videl's friend because her parents know each other well]
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One day Trash is called to a bank robbery, and Videl is there too.
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But suddenly a few strange guys appear ............
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I know that Trash is very much copied from Videl, but I don't know what kind of character it should have.
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P.S. If I want to write the FF I ask you to suggest a couple of suggested titles * g *
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Please tell me if I should write it or not !!
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*TRASH*