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Well, you could give him a nn from his middle name, but then why bother making Richard the first name at all?
Or you could call him by his initials: R.J., R.D., etc.
Or wait till he's developed some distinct personality trait that naturally lends itself to a nn: Flash, Swifty, etc., those these nns tend not to age well or work in formal settings.
I suppose you could use Chard, but it is ugly, a vegetable, and seems like you're trying to hard.

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I think, therefore I judge.