The rabbit is a nice challenge. I don't like the real hobo since it randomly can be very hard or very easy based on factors completely outside of your control. Sometimes he has ailment combinations that quickly doom him.
Sometimes for no noticeable reason he is able to kill your guys in single hits.
His health is such that it becomes a long boring wait till he kills himself/the damage multipliers or kills you and forces a reload.
The name is clever, and the poisonous smell is funny.