Chopperman: Go Go! Everyone's Chopper-sensei

'Chopperman: Go Go! Everyone's Chopper-sensei' is a One Piece spin-off manga set in the Chopper Man universe. It is written and illustrated by Hirofumi Takei (武井宏文). It originally ran in Shueisha's Saikyō Jump in 2011, when the magazine was released as a quarterly extra bundled with Shonen Jump and V Jump. After Saikyō Jump became an independent monthly magazine, the series was replaced by a second Chopperman series.

Premise
Chopper is a reindeer human who works as a health teacher in a school. When one of his students is injured by the evil Dr. Usodabada, Chopper becomes the teacher of justice, Chopperman.

Characters
Chopperman, the Greatest Vigilante (正義の味方) Dressed in his white jacket, he's usually helping children and solving the issues of the schoolchildren, but when danger arrives, he quickly dawns his superhero cape and becomes Chopperman, ally of justice and the greatest enemy of evil! Chopperman (チョッパーマン) is the protagonist of ''Chopperman: Go Go! Everyone's Chopper-sensei'', and the former arch-nemesis of Dr. Usodaba. He works as a doctor at an elementary school, and takes his duty very seriously, getting enraged when somebody attacks or threatens his students.

Ms. Nami, the Director Very attentive to the students of her school, though she's still very feared because of her short temper. Ms. Nami (ナミ技長先生) is the director of the elementary school where Chopperman works. She is very strict with her students and Chopperman, but has a short temper. She frequently misunderstands Chopperman's intentions, though the students correct her.

The Students Full of energy, they love Chopper, who's always ready to play with them. The Students (生徒たち) are the children who study at the elementary school Chopperman works. The group contains young versions of various characters.

Dr. Usodabada, Personification of Evil (悪の権化) ''A genius with an evil spirit, he spends his time creating abominable monsters et terrifying robots to achieve his dream: Taking over the world. His madness is equal only to his cowardice.'' Dr. Usodabada (Dr. ウソダバダ) is a mad scientist, attempting to take over the world. He first attacks Chopperman's school seemingly on a whim, but after his first defeat decides that he will become Chopperman's arch-nemesis. He repeatedly attempts to attack the school, failing each time and continuously losing his soldiers, who join Chopperman. However, at Chopperman's invitation, he switches sides as well, stating that he was only attacking because he was lonely.

Dr. Usodabada's Soldiers Submissive servants, they're always around when Dr. Usodabada sends his monsters to attack. Dr. Usodaba's Soldiers (Dr. ウソダバダ 手下たち) is a group made up of three unnamed soldiers. They follow Dr. Usodabada and obey his orders, and though they don't fully believe in his skills or goals, they are the only people who stay loyal to him throughout the entire series.

Giant Luffy Bomber, Giant Robot (巨大ロボ) ''Created by Dr. Usodaba, his chestplate contains devastating cannons. A cockpit is hidden inside his hat, allowing for him to be piloted.'' Giant Luffy Bomber (ジャイアントルフィボンバー) is a giant robot created by Dr. Usodaba. He has a similar personality to his main series counterpart, and is willing to abandon Dr. Usodabada for a rice ball. However, because he is a robot, he has a functioning cockpit, allowing Dr. Usodabada to enter and pilot him.

Robinflowan, Monstro-flower (お花怪人) Creature put into the world by Dr. Usodabada in the hopes of getting rid of Chopperman. Robinflowan (ロビフラワン) is a flower monster created by Dr. Usodabada to destroy all the plant life surrounding the elementary school. However, she was stopped from destroying the Mushtraw Hats by Zorokiller and the students, and eventually abandoned Dr. Usodabada due to Chopperman's cuteness. She is shown to enjoy playing and spending time with children.

Sanjirops, Perverted Monster (エロ怪獣) ''Monster created by Dr. Usodaba. Weak to feminine charms, he's still very strong against male opponents and is ruthless against anyone who interferes in his quest for love.'' Sanjirops (サンジロプス) is a love-obsessed monster created by Dr. Usodaba, created to pair with Robinflowan. He falls for women very easily, and is willing to abandon Dr. Usodabada after simply seeing Ms. Nami. However, he feels no such attachment for men, attacking viciously if somebody attacks a woman or if he feels like somebody interfered with his love life. He attempts to impress the women around him, even when they don't care.

Zorokiller, Rice Ball Monster (おにぎり怪人) ''Creature created by Dr. Usodaba. It's blades and it's gusts of salted plum pits are formidable, even for Chopperman.'' Zorokiller (ゾロギラｰ) is a rice ball monster created by Dr. Usodabada to ruin the elementary school's rice ball party. However, upon seeing the Dabada Soldiers trample rice balls, he refuses to continue following his orders, stating that he can't work for somebody who would disrespect the food. He was built alongside a remote controller that can control his actions, which was used by Dr. Usodabada to force him to fight Chopperman. However, the controller was destroyed, and he decided to stay at the elementary school, helping to fight against Dr. Usodaba.