In general no. We very much come across as grumpy and sunshine. That said he has more faith in humanity in general and I dislike humanity in general.
However on a daily basis I'm generally the happy cheerful one and he is a man of few words and tends to look like he is scowling and can seem abrupt. We used to work together and people would always assume that he was the scary one (unfortunately my job role was far more cutthroat and the one that needed hard decisions).
However it has often been mentioned that the only time he lights up is with me and the DC. The grumpy scowling man also sends me videos of cute baby animals because it makes me smile. He gets excited when he finds a cool lego kit for the DC and spent an hour gathering samples for the dc to look at under their new microscope grinning when he found a cool leaf they would like.
the grumpy is a bit of an act I suspect.