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Robbie Sonnie is nothing more than another stupid Mary Sue for Christian Weston Chandler to live out his idiotic fantasies with.

This one is Chris's desire to return to childhood where nobody got angry at him for acting like a child.  He is also Chris's ideal self because he is named after Bob, who is awesome and dying and Chris doesn't give a shit but he secretly wants to get some of that ass before he kicks it(don't worry Chris you're not alone).

Oh, and he can only "grow up" into a Sonichu when he wants to.  So he can stay a child forever and not turn into a Manchild like his grandfather.

Like his creator Chrisshun Wessun Chandlur(in Chris's so-called English), Robbie speaks like he has a dick in his mouth.

Also, he looks like a penis.