Zeref

Zeref is considered to be the strongest, most evil Mage of all time, who possesses extremely dangerous, and powerful Magic. He currently appears as a reclusive, self-hating youth who cannot control his powers.Zeref is said to have been the darkest, most evil Mage in the history of the Magic World, mastering the Black Arts and creating many Demons, some of which still wreak havoc in the presentIn the modern era, Zeref seeks to isolate himself and is very calm, sincere, and conflicted.[10] He wishes to die to atone for all the sins he has committed, and may commit in the future. He shows concern for others when he warns them not to come near him, knowing that they would die if they did. He is also somewhat emotionally fragile, as when he realizes that Natsu is not ready to kill him yet, he breaks down in tears. Zeref often kills with no prior incentive or knowledge.

Hisoka

Hisoka is a character from the series Hunter × Hunter by Yoshihiro Togashi. He is one of the main antagonists, although he has helped the four protagonists on a few occasions. He was formely known as a Phantom Troupe member.Hisoka is portrayed as entirely self-serving, self-absorbed and selfish; he does whatever he likes as long as it pleases him in some way. His insatiable love for spilling the blood of powerful fighters in combat and his enjoyment of extreme pain while doing so fuels his seemingly sadomasochistic desires. In order for them to grow to their full potential (so as to improve the pleasure of killing them later) Hisoka allows the main protagonists to live in situations wherein he is easily able to kill them., Hisoka has proven himself to be a deadly warrior. However, his true abilities have never been shown, as he is willing to fight enemies famous for their terrifying power. For instance, he pondered prompting Illumi (whose strength scored 95 points, even higher than 3 Zodiacs') into having a death match with him, and even craved to confront Ging Freecss and Isaac Netero. Apparently, he doesn't fight according to any conventional martial art, combining his tremendous physical attributes with razor-sharp poker cards, an unpredictable mind and an unquenchable thirst for killing.

Chopper Guard Point

Prior to the time skip, Chopper could transform into four different forms under the influence of the Rumble Ball: Jumping Point, Guard Point, Arm Point, and Horn Point. After the two-year timeskip, he is seen being able to perform formidable martial art maneuvers with his new form called, "Kung Fu Point", a melding of Arm Point and Jumping Point, and is now able to produce a new "Horn Point" with larger "Stag Beetle" like antlers which are useful for digging in the ground at high speeds, along with a new and improved "Guard Point" which is now able to grow big and strong enough to protect the Thousand Sunny from one of the Kraken's tentacle's. In addition, he is able to utilize those forms without consuming a Rumble Ball; instead, eating a Rumble Ball now allows him to enter his most powerful form, Monster Point, and fight in it for three minutes. How he managed this is currently unknown.

Ten-Tails Juubi

The Ten-Tails is the combined form of Kaguya Ōtsutsuki and the Shinju, created to reclaim the chakra inherited by her sons, Hagoromo and Hamura, and tied to the legend of the Sage of the Six Paths and the birth of shinobi. A menace to life in the distant past, the Sage and his brother managed to defeat the Ten-Tails and harness its power to usher humanity into a new era. At the end of his life, the Sage split the Ten-Tails' chakra into the nine tailed beasts so that its power could never be used against the world again. Centuries later, its revival became the objective of Madara Uchiha and the Akatsuki. The world of ninja united in opposition of this ambition, resulting in the Fourth Shinobi World War.

Minato kunai

Minato had his own special brand of kunai that he used in combat. As standard weapons, Minato would throw them at opponents or wield them as melee tools; the kunai's triple-prong enhanced their offensive potential. He was skilled enough to effectively wield a kunai in his mouth. Their main use came from the Flying Thunder God seals they were marked with, allowing him to teleport to wherever one of the kunai was thrown. He carried a large number of the kunai in the field that he would scatter across a wide area so that he could move around quickly. He even strategically placed a network of kunai around Konoha's outskirts, including at least two safe houses, so that he could respond to threats to the village wherever they occurred. Although his normal tactics with the kunai did not require precision, Minato nevertheless had excellent aim and could coordinate his throws' timing and placement to allow him to perform complex maneuvers.

Usopp's long nose

It is possible that Usopp's long nose was inspired by the fairy tale "Pinocchio", as Pinocchio was a wooden puppet whose nose grew longer whenever he told a lie.
Usopp's personality could also come from The Adventures of Baron of Münchausen, who said he had traveled around the globe on a cannonball, a lie Usopp himself said in episode 19, though no one gave any attention.
"The Boy Who Cried Wolf" is a story of a boy that often tells lies of an impending wolf attack in order to gain attention, much like Usopp lies of imminent pirate attacks. When the wolf actually did arrive, no one believed him. This story was written by an author known as Aesop. The word "uso" means "lie" in japanese. It is possible these two instances are the influence behind Usopp's name.

Rebecca Gladiator

Rebecca is a gladiator at the Corrida Colosseum who joined a tournament to compete for the Mera Mera no Mi. She is the granddaughter of Riku Dold III, the daughter of Scarlett and Kyros, and the niece of Viola.As she wanted to eat the Mera Mera no Mi, it indicates that she is not a Devil Fruit user. However, according to some of the other fighters, she is known as the "Undefeated Woman", implying that she has never lost a fight yet, but at the same time, it is suggested that she was bullied by Spartan.
Furthermore, she has been trained to fight by Kyros who was the best fighter of Dressrosa colosseum, after he defended her from many attackers, limited as he was as a one-legged toy.