Heracles

Heracles (ヘラクレス, Herakuresu) is a strange man that resides in the Greenstone forest in the Boin Archipelago. He is dressed in a beetle suit and uses a spear and explosives for combat. He saves Usopp twice, once from being attacked by a giant Hercules Beetle, and the other time from a Man Eating Plant. His attacks are apparently very fast.

History
Usopp encounters Heracles on Boin Island where he is sent by Kuma. Usopp asks Heracles to help him against the giant sunflower plant who is trying to eat him alive. Heracles manages to save Usopp & tells him to build up stamina as he is weaker than ants and worms on that island. After initial denial Usopp agrees with Heracles when he sees a giant ant and worm. Heracles easily beats both the ant and the worm and asks Usopp if he wants to eat them. Usopp in his traditional fashion looks in utter disbelief at Heracles's proposal. He then informs Heracles that he is hungry and wants to eat something edible. Heracles takes him to a place where items like ramen, spaghetti, ham and chocolates are available in plenty. Usopp starts to gulp down the items and is told by Heracles to also work out to build stamina as eating alone won't do it.

Later Heracles loses sight of Usopp who is busy eating out all the delicacies available on the island. When he finds him Usopp has already turned fat. Usopp is told to lose some calories when all of a sudden the island starts to move and eats everything on it. Both Usopp and Heracles try to escape. Heracles is able to catch hold of a branch and tries to catch Usopp but Usopp becomes too heavy for Heracles to hold on to. He waves his goodbyes to Usopp believing it is inevitable that Usopp will be eaten. But Usopp catches a ramen branch and eats it to climb up and escape. Later Heracles finds Usopp and tells him that fat things will definitely be eaten on the Boin Archipelago. He also informs him that it is impossible to escape the island.

Eventually, Usopp resolves to leave the island regardless of Heracles' warnings. Usopp attempted to get past a giant beetle but failed. Heracles tells Usopp that escaping the island is impossible because of the giant creatures that get attracted to the aroma of the island. The island starts to move again and Heracles saves Usopp from falling into the island's mouth. Heracles then asks Usopp what's wrong. Heracles noticed that Usopp's behavior changed after reading a newspaper that was dropped by a news coo. Usopp answers by saying that Luffy is in pain after losing his brother and that Usopp needs to be there for Luffy.

Trivia

 * He often adds "n" to the end of sentences (in Japanese). For example, He called Usopp (Usoppu ウソップ) Usoppun (Usoppun ウソップン), and he himself is Heraclesun (Herakuresun, ヘラクレスン). He also has a habit of repeatedly introducing himself.
 * His name, Heracles, comes from the Greek Hero Heracles, known as Hercules in Rome, or rather from the Hercules Beetle.