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

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