As Merlin the mechanical owl, you pick up the bombs that Mordred throws out, then fly up above the robot and drop them on the green orb when they turn red. The explosion will damage the suit.
Avoid the projectiles thrown by the robot warrior suit, then fly down and grab a bomb when it is black (you must drop it when it first turns red). After you drop the first one on the robot, it may launch TWO projectiles at you. Hitting the robot the second time causes Mordred to zap Merlin.
(see the related question)
When you defeat Mordred, the game is over, and the Princess will kayo him for you. (see the related question)
With Mordred
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Nothing. When you defeat the giant robot, you take the Orb back to Arturus and Mordred is left behind in his castle. You receive the island medallion.
You can't costumize him.
I think that it was Mordred.
It is next to the Mordred Museum at the entrance to the island.
Mordred is somewhere in space. Defeat the three planets and you can find the Golden Key (on the giant asteroid at X-11 Y-80). (see related question)
In the left corner of Mordred's lair.
Mordred does not appear as an interactive character, so it is apprently not possible to copy him.
Defeating Mordred and his warrior suit wins the island, and you receive the Island Medallion and 50 Poptropica credits.
Twice.