Zen-Aku

Zen-Aku appeared in 2002 TV series called Power Rangers Wild Force. Zen-Aku is a Wolf Duke Org who had manifested from the Guardian Merrick Baliton, when the latter needed the former's mask to defeat the original Master Org 3,000 years ago.

Initially, Zen-Aku displayed mixed characteristics of an Org and human because of Merrick's influence while they were merged. When Nayzor's bug erased Merrick's influence, Zen-Aku became completely under Nayzor's control.

After being free from the bug and separated from Merrick, Zen-Aku only wanted to merge with Merrick. It was hinted he did not want to be alone and lonely because he told Merrick he (Zen-Aku) was "cast aside, discarded, rejected". In addition, Zen-Aku was far more powerful now because his power was no longer divided between himself, Merrick, and Merrick's Wolf, Hammerhead Shark, and Alligator zords and fusing with Merrick again would have only served to weaken Zen-Aku once again.

After being resurrected a second time, Zen-Aku has mellowed down and is seeking redemption, no longer interested in forcing Merrick to refuse with him and when Merrick invited Zen-Aku to join him, he referred to Merrick as an "old friend".

No one knows much of Zen-Aku's origin, only that his Org spirit was locked within an evil Wolf Mask. When Merrick's friend Animus had perished at the hands of the original Master Org, Merrick made the decision that he had to stop their enemy once and for all. Heading into a temple, he'd found the Mask of Zen-Aku, put it on, and used his Predazord to destroy the evil Master once and for all.

However, after Master Org was defeated, the Wolf Mask had seized control of Merrick's mind, turning him into (or merging him with) the evil Zen-Aku. While he still had some of his humanity, he implored his fellow Animarian Guardians to kill him, but they refused and instead used their Crystal Sabers to seal him away in an underground coffin.

For 3,000 years, Merrick, now Zen-Aku, remained in stasis until the Master Org of the present-day summoned a General Org named Nayzor, who released the Duke Org on the present-day Guardians of Animaria ― the Wild Force Rangers. Though he had no any memory of his former life, he knew that he wanted revenge on the Guardians who sealed him away 3,000 years ago, and he tried to take it by capturing the Rangers' Wildzords and turning those he captured against their chosen ones.

Zen-Aku also revealed that his power came from the phases of the moon, as he was at his strongest when it was full. During the New Moon's phase, he was revealed to be human when Cole saw a young man in the river, accompanied by the wolf cub Zen-Aku had rescued.

Zen-Aku was able to control his own Wildzords, which he called the "Dark Wildzords", using his flute plate to summon them. He could also combine them to form the Predazord. Zen-Aku's primary weapon was his Crescent Blade, whose blade could open at two notches. While in that position, his weapon's attack was the "Crescent Wave", which was a blade of dark energy that could disable almost any of his opponents.

Over time, Zen-Aku's true nature had been revealed, as he began slowly acting more and more human, by starting out with caring for Alyssa, the White Wild Force Ranger and rescuing a wolf cub from an attack from another Org. The Rangers began to grow confused, and even more so, when the spirit of Animus appeared in the sky and urged Zen-Aku to simply "Remember." However, just as his human self (Merrick) was about to break free of Zen-Aku's curse, Nayzor arrived and turned him into his willing slave, making him unable to be reasoned with.

When Princess Shayla learned that Zen-Aku was really her faithful Guardian Merrick, she tried to piece together the events of the final battle in Animaria. She discovered that the source of the curse put on Merrick was not the Wolf Mask, but his Predazord. After Master Org was defeated, Predazord had turned evil, and its chosen Guardian along with it. She informed the Rangers that defeating Predazord was the only way to break Merrick's "curse". With a new Wild Force Megazord combination, they did so and reverted Merrick to his human form, destroying Zen-Aku's mask in the process.

Merrick thought Zen-Aku was gone forever when his Predazord was purified of the evil that poisoned it, but, a number episodes later, Zen-Aku returned with an agenda. Although he no longer needed a host to survive in the mortal world, he chose to attempt to remerge with Merrick once again for power. With the return of the Wolf Duke Org, the Rangers began to question Princess Shayla about this event. The Princess explained that when Zen-Aku's spirit merged with Merrick, it was divided among the Mask of Zen-Aku, Merrick, and his Predazord, but with Predazord and Merrick now good again, Zen-Aku (who was now free because the purification of the Predazord broke both curses on the mask, including the one that imprisoned his Org spirit) possessed all the evil power that was once divided, and was now much stronger than he had previously been, proving it by holding his own against the Predazord and the Wild Force Megazord Striker while even being able to block the latter's finishing move. However, after Merrick used a new trick pool shot (taught to him by Willie at the Road House) involving the Predazord's Gator Staff and the Armadillo Zord to break Zen-Aku's horn and weaken him, the Wolf Duke Org was apparently destroyed by Predazord's "Revolver Phantom" attack.

After Master Org was defeated, Merrick traveled the world, and Zen-Aku mysteriously returned, offering to join him, since they were both "lone wolves looking for redemption". This act turns him from a villain to an anti-hero.

Powers and Abilities
Unlike other Orgs, Zen-Aku has superhuman strength, stamina, resistance, agility and speed that exceeds that of the Wild Force Rangers. Zen-Aku is powerful enough to take on all five of the Rangers in close combat without too much difficulty. His primary attack is the "Crescent Wave", the only special attack of his blade, which was a blade of dark energy that could disable almost any of his opponents. Though he is a formidable opponent, his greatest strength comes out during full moons. Strangely, Zen-Aku also had his own set of "Dark Wildzords" and can also capture other Wildzords for his own uses. Zen-Aku can also grow to giant size, as he demonstrated after being separated from Merrick and losing the Dark Wildzords. In addition to his powers, Zen-Aku has proven himself several times to be an excellent hand-to-hand combatant and swordsman, capable of defeating the Rangers in every battle. He is apparently incredibly resilient as he lost his horn and was apparently destroyed by the Predazord yet he later managed to return.
 * Strength: With Super-Human Strength, he can grab hold on a person and drag them with one hand, and even toss them far. He is able to block and stop the Red Ranger attack (wearing a lion claw-gauntlet) with just his arm.
 * Speed and Agility: When he was free and began his attack on the rangers, he moved so fast that he appear to be a blur and jump around that no one can react or defend themselves from Zen-Aku's attack. During his fight with the Red Ranger, he dodges and avoids the ranger's blasts with ease.

Arsenals

 * Crescent Blade: Zen-Aku's primary weapon which was a large double sided blade. Zen-Aku's primary attack with the weapon is Cresent Wave. "Cresent Blade! Cresent Wave!" is the call of his attack.
 * Flute Knife: He can also use this weapon to quicky strike an opponent, but it is primarily used to summon his Dark Wildzords in a similar manner to the Dragon Dagger.


 * Dark Wildzords (Former): Zen-Aku was able to control his own Wildzords, which he called the "Dark Wildzords", using his flute knife to summon them. He was able to combine them to form the Predazord and they are:
 * Alligator: It was the whole body of the Predazord.
 * Wolf: It was the left arm of the Predazord.
 * Hammerhead Shark: It was the right arm of the Predazord.


 * Stolen Wildzords: Zen-Aku could also freeze Animal Crystals and take them under his possession. He stole the Black Bear, Polar Bear, Giraffe and Elephant Wildzords. Like the Wild Force Megazord, his Dark Predazord could use the stolen Wildzords as arm attachments in battle.

Weaknesses
He also has several weaknesses like:
 * New Moon: As if it were a real werewolf, he loses all his power during the new moon and reverts to his human form, Merrick Baliton. However, since they are independent entities now, it is possible that he doesn't have this weakness anymore.
 * His Horn: Like all the Duke Orgs, whenever he loses his horn, he loses his power and his life.
 * Sacred Water: Like all the Orgs, he suffers when touching the Sacred water of the temple (though he can survive to this if he cut his horn, but he'll die eventually).