Surprisingly this was more fun to make than I anticipated.
If you want to read through all my lines of reasoning, feel free to read under the cut. Feel free to add more to the discussion!
Also, I used this article to pinpoint each character in their alignment, but I'll pick a few lines that best describes the alignment under the cut.
Lawful Good
"They seek to eliminate evil, and are willing to forego their own comfort or safety to protect others."
Sho Yamato
- Sho is the textbook definition of a superhero in terms of morale. He refuses to sit idly and is very much willing to go out his way to bring justice to every wrong he comes across. That's his very character.
Miss Yuki
- Yuki, much like Sho, goes out of her way to help out. Even before she found out about Sho as the owner of an Idaten Bike, she was quick to assist them to make sure he doesn't caught in a bad place. This behavior is recurring, and her compassion extends to even to the likes of Gabu despite what the kid did.
Ayumu Yamato
- Much like his brother, Ayumu is very willing to help out deal with situations. He's empathic, and is willing to take the extra mile to help or thank people (ex. meeting Kiku). He doesn't like to stand to the side, but is still an obedient kid considering how much he respects Sho and the "no riding" rule early into the Team X arc.
Neutral Good
"Those under this alignment are willing to recognize unjust laws, and are open to bending the rules if it helps more people."
Kyoichi Shido
- I initially put him under true neutral considering his behavior earlier on, but for the entire show it seemed more fitting that he'd be put in neutral good. He's a lot less willing to go out his way compared to Sho, but will step up and help someone out if need be. That doesn't mean he's all goody-two-shoes though, as he will go against the rules if it meant for the better good (ex. rescuing Takuma from the volcano eruption despite Idaten Battle rules stating no riders should interfere with a race). A more prominent example though is that he's more than willing to omit information and even say hurtful things to Sho and co. if it meant helping the team improve.
Kakeru Sakamaki
- Kakeru wasn't given enough screen time by the show compared to Sho and Makoto, but given how he responds to situations he has a very strong sense of right and wrong. He's quick to call out Shark Tooth in episode 1 how the race's winning conditions were unfair and is even willing to compromise for the training grounds, but he doesn't have enough driving force to push through what he says.
Chaotic Good
"They don't care much for rules or regulations, but a strong sense of right and wrong remains rooted in the hearts of Chaotic Good characters."
Makoto Shido
- Girlypop is very willing to throw hands against every antagonist in the show.
- But for real though, Makoto, much like Sho, is very willing to step up and deal against injustice, but unlike her friend who'd do it through races, Makoto is very much willing to forego those formalities to get the point across (throwing a metal basin against one of the rouge gang members in ep. 10, consequences be damned, and she even has a wrench ready for round 2). She's also very vocal about injustices towards her as a female, and although her fighting against is has a notion beyond herself. She's belittled constantly because of her gender (and Japan IRL is very patriarchal), but yet she proves time and time again that she's just as capable as the rest of them, and by extension proving that girls are equal to their male peers.
Lawful Neutral
"Lawful Neutrals believe in organization. Many are devoted to law and order, believing that their nation or faction would collapse without it."
Arthur
- Predictably as a knight, Arthur has a very rigid moral code. Although he could've fallen more in Chaotic Good during his disguised era, with his fake reckless/clumsy acts causing mayhem, my defense is that his people, his royalty were the ruling organization before Shark Tooth, hence he's only doing what he can to restore that rulership while he's by himself. The reason why he falls under neutral instead of good is because he's more rigid with his morales, hardly considering Gabu an ally while battling against Team X, unlike Yuki who has the patience to console Gabu despite it all. Another reason why I consider him more neutral is because of his response to Imperial Knights and possessed Kyoichi: he may mourn that they were possessed by the Dark Emblems, but he doesn't let that hinder him from accomplishing the responsibilities assigned to him.
True Neutral
"...are often characterized as survivors, doing whatever they have to do in order to keep themselves or their loved ones alive and thriving."
Koei & Kiku
- It makes sense that these siblings are more likely to look after each other first before anything, considering that they're financially struggling. Koei was a pickpocketer prior to being hired by Gabu, and even then he chose to work under Shark Tooth as a means to fund his sister's medical needs rather than going for an honest job.
- Kiku could've been put in the Chaotic Neutral aspect, since she desperately yearns for her own freedom and disobeyed Koei and the hospital staff for it, but considering how quickly she was to try and protect Ayumu after she befriended him this alignment seemed to suit her better. She's quick to defend her loved ones on their behalf, going out of her way to defend Koei's honor not only to strangers but to Sho as well. However, maybe it's because she's physically ill but we've never seen her go out of her way to help out people she didn't know, so she fails to be in the Good alignments because of that.
Chaotic Neutral
"...chaotic neutral characters value their freedom above all else."
"Chaotic Neutrals are individualists first and last."
(note: the initial candidates for this category was Yoko and Rika because it's so hard to find recurring characters under this alignment, but after watching through some eps I found the best candidate for it)
Hosuke
- Since most of Hosuke's screen time is dedicated to his character as an amnesiac owl, this is how I based him. In a literal sense, episode 2 his introductory lines is literally begging for the group to free him, but overall as a character Hosuke tends to put his wants first, even so much as to throw the kids under the bus when he felt neglected in favor of women flaunting over him in episode 7 (side note: a character trait of his that I absolutely despised, and im thankful they toned it down much much later on in the show) and demanding more food from the Four Kings in episode 38 without regards of whether they had more or not. He his selfish yes, but what keeps him from being categorized under the evil alignments is that he wouldn't go out to cause unnecessary harm, and is willing to accept the consequences of his transgressions (sometimes). If something is not going his way, he will very much be vocal about it.
Lawful Evil
"...are capable of vicious cruelty and plenty of illegal deeds — but they follow a strict internal code, and thus often believe they are doing what is right or honorable."
- Putting it out now, "lawful" doesn't mean the laws of the land or ethics as a whole, but rather a character's capability of adhering to a set of rules. Tyrants, fanatics, and extremists are best examples of this alignment, but the reason why Gabu isn't on here will be explained later on
Taiga Samejima
- Despite the examples given, I consider Taiga to be in this alignment is because of the definition of following a strict internal code. Yes, he's willing to put heinous henchmen out there to hinder the protagonists, or for the benefit of Shark Tooth, but still he believes in playing fair during Idaten Battles. Outside that though is a far different topic (in episode 11 he had no qualms about Captain Jackal deserting Sho and co. in an abandoned island, but scolded him and the crew for violating the rules of Idaten Battle). He followed and assisted Gabu without complaints, only trying to step in and interfere when he realized that his brother was going too far. Yes, he's capable of harm, and yes he will do it if need be, but only if it doesn't go against his own code.
Neutral Evil
"They have goals to accomplish, and they're certainly not going to stand in their own way."
Gabu Samejima
- It's like this alignment was meant for him. Gabu will do whatever it takes to become the strongest out there and hold the power for himself. What makes him different from Lawful Evil is that he doesn't care; if you're in his way, he will take you out. He has an eye for theatrics through intimidation, and gains satisfaction from it. He's self-serving and willing to blackmail and manipulate people to get what he wants, but he's meticulous about it as well. He's impulsive, sure, but he won't go out of his way to cause unnecessary collateral (and yes, during the Team X arc sabotaging plans and wanting to abandon the group multiple times was necessary collateral for him; he knew he couldn't get Imperial X by himself, despite what he says). He hardly holds remorse for his actions, since he could really care less about what the others think of him.
The Four Kings
- As Gabu's loyal henchmen, they'll do whatever they needed in order to give Gabu the upper hand—moral code be damned (hence why they fall in this category and not in Lawful Evil). Although there are times they question Gabu, in the end they'll still bend their backs for him.
Chaotic Evil
"These characters often take pride in causing suffering, and pursue destruction for its own sake."
Takeshi Yamato (possessed)
- Takeshi himself is not an evil man, but under the possession of the dark energy he aims for nothing else but mass destruction. He's willing to not take down but to obliterate anyone for this cause, without any regards for anyone or anything (he let Sho fall hundreds of feet off the air for the sake of winning). Chaotic Evils are the most dangerous and destructive out of all the alignments, so it also stood to reason that the biggest threat of the show falls here.
I made some experimental Pokémon Trainer cards for the Idaten Jump gang. I used this site and picked random trainer icons I felt vaguely resembled the characters (I didn't have time to draw redesigns of them all as Pokémon trainers orz).
I based their types off of this post I made before, but I implemented a few changes: Kiku and Gabu have swapped types with the former now being Psychic and the latter Poison, and Arthur mostly has rock and ground types instead of grass; because I felt these types had mons that suited the characters better.
I also gave the Four Kings fish mons instead of Normal types like I originally planned (because I HAD to give them Feebas and Magikarp which they would lovingly bring to battle and cheer on every time just to use splash and faint lol).