Axem Blue is the main Antagonist of ARA. His main role in ARA is to capture all of the required items to for-fill an ancient prophecy.
Axem Blue is a rude, and smartallic robot. He will do whatever it takes to complete a mission, and will only listen to his master. He shows no mercy towards anyone, or anything.
Though the full series/movie has not been created yet, it is known from episode one that Axem Blue retrieves all 120 Power Stars from Mario & Bowser.
It is also known that Axem Blue obtains a handful of Chaos Emeralds from Sonic and Shadow in episode, which can be predicted to occur once again once the movie debuts.