Mr. White has a thin grey beard as stated in the passage " he hid a guilty grin in his thin grey beard."
Mr. White is very hospitable as stated in "haste, and opening the door, was heard condoling with the new arrival" when greeting the Sargent
Mr. White is very skeptical and relies more on experience rather than someone else to believe something. This can be seen when he says “If you don’t want it, Morris,” said the old man, “give it to me.” after the sergeant throws the paw onto the fire because he said its dangerous
Mr. White although hospitable is very negative as seen when he says “of all the beastly, slushy, out-of-the-way places to live in, this is the worst. Pathway’s a bog, and the road’s a torrent". He doesn't really think about any positives
Mr. White is humble and is fair as seen when he tries to give money to the sergeant in exchange for the paw even though the sergeant didn't want the money as seen when he says “A trifle,” said he, colouring slightly. “He didn’t want it, but I made him take it." when he explains it to his family in the passage.
I can infer that Mr. White is a man of many talents as we have seen him play chess and saw him sit "down at the piano and struck a few impressive chords." as said in the passage.