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I'd leave it G. The letter G is pronounced the way you want it to be pronounced, so it's clear. If your test readers find it confusing (which I doubt they will), you could use some exposition the f...
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Source: https://writers.stackexchange.com/a/46921 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I'd leave it G. The letter G is pronounced the way you want it to be pronounced, so it's clear. If your test readers find it confusing (which I doubt they will), you could use some exposition the first time the character does that. > "Yeah, right, G," said Thomas, reducing Gary's name to a single letter, and not even the hard "G" of "Gary", but the weak, limp "G" of "gelatin" or "germ," as if Gary weren't worth the effort of the hard "G". Okay, so that's rather overwritten, but you get the idea. :-)