Final answer:
When assessing Mr. Sumo's urine in the immediate postoperative period, one would anticipate darkening of urine upon standing, abdominal pain, vomiting, constipation, and cardiovascular abnormalities.
Step-by-step explanation:
The characteristics that would be anticipated when assessing Mr. Sumo's urine in the immediate postoperative period include darkening of urine upon standing, abdominal pain, vomiting, constipation, and cardiovascular abnormalities. These characteristics can be indicative of various underlying conditions or complications.