USOPP & HERACLES
Heracles is a strange warrior that used to reside in the Greenstone forest in the Boin Archipelago. He trained Usopp in the use of Pop Greens for two years in order to become “the true king of snipers”. He saved Usopp from being eaten multiple times.
SANJI & IVANKOV
Emporio Ivankov is the “Queen” of the Kamabakka Kingdom and an officer of the Revolutionary Army.
Ivankov trained Sanji during the two year timeskip. He did give Sanji a challenge so that he could get the recipes for the Attack Cuisine.
ZORO & KOSHIRO
Koshiro is Zoro’s teacher and Kuina’s father. He is the Dojo Master of Isshin Dojo in Shimotsuki Village.
Zoro is grateful to Koshiro for teaching him the sword and giving him the Meito Wadō Ichimonji.
FRANKY & TOM
Tom was a powerful long-horned cowfish fishman, known as the most skilled shipwright in the world. He was also Iceburg’s and Franky’s teacher. Furthermore, he was well known for being the builder of the Roger Pirates’ ship, the Oro Jackson.
Franky had utmost respect and admiration for his mentor as a master shipwright. Tom always praised Franky for the often ingenious designs he would come up with.
CHOPPER & DOCTOR HILULUK
Dr. Hiluluk was a quack doctor from Drum Island, as well as Tony Tony Chopper’s father figure.
Hiluluk loved Chopper and even ate a poisonous mushroom to encourage Chopper to became a doctor.
That showed how strong Hiluluk’s love was, as he took the deadly dish despite his life’s work not yet proven to be completed. Chopper was devastated by his death and decided to become the best doctor he could through the teachings of Kureha. Despite the superior skills of Kureha and other doctors, Chopper would forever memorialize Hiluluk as the “greatest doctor in the world”.
KOBY & MONKEY D. GARP
Garp is one of the most powerful Marines seen in the series so far. He took charge of both Koby and Helmeppo’s training.
Koby admires Garp, even though he maintains a highly brutal clutch on him because he would not be where he is without him.
SANJI & ZEFF
Zeff is the head chef and owner of Baratie, former captain of the Cook Pirates and was also Sanji’s cooking mentor and adoptive father.
Zeff helped him develop his cooking skills and teaching him the value of a cook’s hands. Sanji’s signature fighting style was developed as a result of this teaching, which included Zeff beating him up whenever he threatened his hands in combat.
ZORO & MIHAWK
Dracule Mihawk is a member of the Shichibukai and the “Greatest Swordsman in the World”. He served as Roronoa Zoro’s swordsmanship master during the two-year timeskip.
Mihawk was a strict teacher. When teaching Zoro how to use Haki, he forbid Zoro from drinking alcohol until he fully mastered infusing his swords with Busoshoku Haki.
Having lost one rival in Shanks, Miahw now shares a rivalry with Zoro, and is prepared to wait as long as it takes for Zoro to become strong enough to beat him.
MONKEY D. LUFFY & RAYLEIGH
Silvers Rayleigh is the former first mate of the Roger Pirates, known as the “Right Hand of the Pirate King”. He served as Luffy’s mentor in the use of Haki during the two year timeskip.
After the two year timeskip, it is apparent that both of them became close from their training together. Luffy strongly respected Rayleigh as a mentor. During his time training on Rusukaina, Luffy was willing to even endure hunger as punishment. Rayleigh himself proudly proclaimed Luffy as his pupil to the Marines. Rayleigh compared his late captain to Luffy, claiming that destiny is slowly but surely taking shape, and that Luffy has become a man well fit to wear that Straw Hat.
SABO & MONKEY D. DRAGON
Monkey D. Dragon is the infamous leader of the Revolutionary Army who has been attempting to overthrow the World Government. He is the World Government’s greatest enemy, and is the most dangerous and most wanted man in the world.
Dragon was actually the one who saved Sabo, and because of him, Sabo ultimately joined the Revolutionary Army. Dragon personally trained Sabo, enabling him to rise through the ranks until he became the Revolutionary Army’s chief of staff.
Sabo refers to Dragon as “Dragon-san” and is loyal to him and is trusted enough to lead the Revolutionary Army’s investigation of Donquixote Family’s weapons trade. Even after regaining his memories, Sabo did not leave the revolutionaries to resume his dream of being a free-sailing pirate, showing a firm conviction to Dragon’s cause.