It is taller and more muscular. The bones that were in Chaos 1's right arm now run along both of Chaos 2's arms and now both hands have Emeralds. Its head has moved forward, giving it a more unpleasant appearance, the horns on his head have also changed position to give it a hammerhead style look.
Powers and abilities
Because of the two Chaos Emeralds empowering him, Chaos' hydrokinesis is enhanced to the point that he can produce water over a huge area. His strength is also increased, giving him more powerful punches and extendable limbs (though stretching renders him vulnerable). For defense, Chaos 2 can generate an energy shield that cannot be bypassed. He can also shapeshift to assume forms like a giant ball. In some occasions, Chaos 2 can separate himself into several sphere projectiles that home into opponent, with his brain enveloped into a real aura for a short time afloat in mid-air, as another way to attack.
To start the boss battle with Chaos 2 using Knuckles the Echidna, the player has to enter the Hotel Restaurant in Station Square.
In battle, Chaos cannot be attacked, until he begins to first. As attacking, cause him to use his energy shield. When he attacks, aim for a punch at him, rendering him to his water form until he return back. If he takes as a sphere form, jump at it, to make him leave this form to attack. After dealing three damages, he will consume the arena with water, glide to bypass this type of harmful water, until he returns back. And when he attacks once again, finish him.
Apperances in other media
Chaos 2 first appeared in "Pure Chaos" in Sonic X. After Dr. Eggman showed up, he took Cream's Chaos Emerald and fed it to Chaos 0, transforming it into Chaos 1. Almost immediately after, he gave another Chaos Emerald to Chaos 1, transforming tried into Chaos 2. Sonic and Knuckles, having arrived at the scene, tried their hardest to fight Chaos 2, and with luck, they managed to defeat it. Afterwards, Eggman sucked up Chaos 2 into his Egg Mobile and flied away.
In this media, Chaos 2 can spray high pressured water from his hands and has a near-unbreakable shield of electrical properties.
Though Tikal said that his brain must attacked to deal damage, Chaos 2 is vulnerable in any spot, unlike Chaos 0.