Can a Champion Unit be targeted by Possession (i.e., is a Champion Unit considered a Unit)?

Question

Accepted Answer

Ruling: Yes, Champion Units are units in every sense of the word and can be targeted by Possession.

Nuances:

Champion Units can only be targeted by effects like Possession once they have been played onto the battlefield
You cannot use Possession to target a Champion Unit while it is still in the Champion Zone
The only difference for Champion Units is that they are the only kind that can start the game as your Chosen Champion and must match the name of your Legend