Imperial is that which relates to an empire, emperor, or the concept of imperialism.
Politically, an empire is a geographically extensive group of states and peoples (ethnic groups) united and ruled either by a monarch (emperor, empress) or an oligarchy.
So, from those definitions, I would say no.

BO aspires to Tyrant (he's already achieved status as Dictator).

A tyrant (Greek τύραννος, tyrannos), in its modern English usage, is a ruler of a horrible and oppressive character[1] who is an absolute ruler unrestrained by law or constitution, and/or one who has usurped legitimate sovereignty.

A dictator is a ruler who does not rule through democratic means. When other states call the head of state of a particular state a dictator, that state is called a dictatorship.