Peacockpubes [link] once drew Valve concept art Pyro and I found myself liking him also.
You can't possibly read my handwriting so here you go:
Engie says: "Well I don't want to brag but this one is one of my greatest inventions.."
The cake says: "CONGRTS FOR THE SEX" Pyro says: "I would have brought candles but I had burnt them already and Scout ate few strawberries I burned him too"
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Whole crew by VALVe Find concept art of the Pyro here from the official wiki: [link]