depending on what side the stroke occured on and how severely it effected the brain - the person's personality can be effected.
The incidence of bizarre unpredictable behavior after traumatic brain damage is well-documented. As for becoming "more demanding" that too can result from brain damage.
These problems are not very common, of course and ordinarily, a stroke results in a tendency towards passivity.
A stroke that causes damage to the pituitary often causes severe personality changes because of the resultant hormonal imbalances.
The term is stroke survivor not victim.