Chaos 4 (Sonic X)

Chaos 4 (カオス 4) is a transformation that appears in the anime series Sonic X. It is the form attained by Chaos after absorbing the negative chaos energy of four Chaos Emeralds.

Appearance
As Chaos 4, Chaos is more fish-like, differing greatly from its appearance as Chaos 1 and 2. Chaos 4 has a shark-like body with a dorsal fin on both its back and head (the latter which looks like a horn) and the flaps on the sides on its head have grown longer. It also has two sharp pelvis fins and a pair arms like those it had as Chaos 2, except their hands look more like fins and lack thumbs. Inside its hands and wrists it has grey bones, each with a Chaos Emerald embedded in them. It also has bones running from its tail fin to its belly where it has a pelvis-like bone holding two Chaos Emeralds.

Anime
Chaos 2 transformed into Chaos 4 when two Chaos Emeralds from a battle between Sonic and Dr. Eggman fell into the pond it hid in. It then attacked Sonic and Tails, making Sonic engage it at its pond. With Chaos 4 in its right element though, it proved too powerful for Sonic until it was knocked out by a Spin Attack which Sonic empowered with the local turbulent air currents. Eggman then sucked Chaos 4 up with his Egg Mobile and withdrew.

Chaos 4 later appeared on the Egg Carrier to corner Chris and Big when they tried saving Froggy. There, it was given two more Chaos Emeralds by Eggman and evolved into Chaos 6.

Powers and abilities
With the power of four Chaos Emeralds at its disposal, Chaos 4's power surpasses that of Chaos 2's. In this state, Chaos' hydrokinetic abilities have been bolstered even further, allowing to conjure up an entire water cyclone. It also has the ability to change water quality. Being made of liquid chaos energy, Chaos 4 is as well nearly indestructible and can mimic the properties of water―if dissipated, it can reconstitute itself again.

Chaos 4 has the ability to discharge energy waves with a swing of its arms, potent enough to multiple people flying off their fleet. Its new form also lets it an efficient swimmer who can move quickly through water.