What are the characteristic of Harry Probe in the story of Poison by Road Dael?

First of all, the character is named Harry Pope, not Probe. Second, the author is Roald Dahl, not Road Dael.

One of the main things that need to be understood about the story is that Harry believes he is about to be bitten by a krait, which is an extremely poisonous snake. At first, we are made to believe that he is an extremely intelligent person and extremely level-headed not to have moved when he first thought he saw the krait. However, as the plot thickens and the tension builds, we see him as somewhat hot-tempered, though it can be assumed that this was an effect that the amount of pressure he was under. However, we begin to see Harry as something of a racist when he calls Dr. Ganderbai a 'dirty little Hindu sewer rat'. While Timber writes this off as an effect of the pressure, Ganderbai sees it for the inexcusable prejudiced remark that it is. What's more, he seems to relish his chance to lash out towards Ganderbai. When the doctor asks Harry if he is absolutely certain that the krait was there in the first place, Harry is described as having 'a shining look in his eyes', which gives us the impression that he derives some sort of pleasure from his rage and Ganderbai's apparent embarrassment. We also are given the impression that Harry is somewhat attention deprived and made up the whole story about the krait to cause a commotion, though it it is untended to be unclear whether he planned the story maliciously or if it was a subconscious need for attention breaking through.

For further reading by Dahl, I recommend his short stories Taste, Lamb to Slaughter and The Way up to Heaven.