The Reveal: He is revealed to be Tomoe and Enishi's father, and Kenshin's father in law. While he did recognize his son-in-law, when he and Enishi met it's not clear whether he also recognized his grown-up son.
The Higashidani family
The Higashidani family (father Kamishimoemon, mother Naname, first son Sanosuke, daughter Uki, second son Outa)
Action Dad: Kamishimoemon is a rather good fighter, though Sanosuke turns out to be better than him.
Blush Sticker: Outa, nicknamed "Apple cheeks" for his perpetually red face.
The Bus Came Back: An older Outa appears in the Hokkaido Arc, having listened to Sano's advice and joined the Kamiya Dojo.
Adult Fear: As Yumi is mourning for her dead "sister" Hanabi, she realizes that the twins aka her other "little sisters" aren't anywhere on sight and have been taken away by Ichigase's Wadatsumi troops. Then she experiences almost exactly the same terror that anyone in charge of children can potentially feel when their wards are taken away.
Made a Slave: After killing Hanabi, Ichigase kidnaps the two little girls and intends to sell them as slaves to foreign crews, who have "taken a fancy to Japanese things", like the two "porcelain dolls". This is foiled by the Juppongatana, as Yumi offers herself to Shishio in exchange for saving the girls and punishing Hanabi's death.
Evil Is Hammy: A thoroughly rotten bastard, but also entertainingly loud and flashy.
Faux Affably Evil: Seems to be a cheerfully militaristic fellow with rather flowery speech patterns, but then he shows himself as quite the megalomaniacal Blood Knight.
The Generalissimo: An official of the newly created Imperial Japanese Navy, and prides himself after his work out in seas of Osaka Castle.
I Have You Now, My Pretty: When Yumi refuses to perform for him since she doesn't want to work with anyone affiliated to the Meiji Government, his reply is this:
"If I cannot buy your company, I shall buy you. Perhaps you shall less easily refuse the company of a master rather than a customer" note (This is an allusion to the "mi-uke" practice, in which a geisha's customer would buy her freedom from her master/s to have her as his wife or mistress)
Ironic Echo: A villain that would probably get even Kenshin gnawing at his leash: the worst remnants of the Tokugawa Shogunate strained to perfection and mixed with the justifications and motives of the Imperialist and pro-Facism movements of the Western world. Made even more ironic in that he fought under the Isshin Shishi, the side that denounced the samurai caste and essentially the han caste system that all of Japan had followed for the last near 1500 years. He even seems like an upgrade of Ujiki, the bloodthirsty Corrupt Cop of Ruroken's earliest chapters.
Just Following Orders: A major example of his militaristic Day of the Jackboot philosophy. Anyone who is considered an extreme liability to his own progress- and by that, his self inflated idea that he is the government by extension -even by accident is so much as subject to his self righteous command of a death penalty. This so much as includes innocent civilians and even children who so much as accidentally nudge him in his way of progress.
Smug Snake: While an excellent fighter, he's also very prone to killing people for mere details (like Hanabi), very fond of using others for his plans ( like Akari and Kogari) and, in the end, has an overinflated sense of his own might. And when he tries to go the Evil vs. Evil way with Shishio is after Yumi's Please, I Will Do Anything! gives them the chance to fight, Shishio is more than happy to cut him down.
Victorious Loser: Even if this guy is a future embellishment for Ruler of Flame, Sameo's ideals can be considered more in line with the Empire of Japan on a tangible level.
The Charmer: He has the better social skills of the new trio and tries to be this.
Desperately Looking for a Purpose in Life: As a half-blood, Alan longed to find his actual place in the world and that's implied to be why he followed the "Occidentalization" social movements that came out when Japan stopped being isolated.
Fire-Forged Friends: He and Ashitaro are comple opposites, but at the end of Ashitarō zenka ari they've reached this.
Mixed Ancestry: Not only does he have a foreign first name and light hair, but his teacher Kaoru explicitly says that Alan's father wasn't Japanese. In fact, up until the end of Ashitarō zenka ari he dyed his hair black to avert being abused for his heritage.
Multi-Ethnic Name: His first name is American/English while his last name is Japanese.
Recruited from the Gutter: As shown in RK Ibun: Ashitarō zenka ari, Alan was a thief until he got caught trying to smuggle into a boat to the USA, jailed for a while (and he met Ashitaro in jail) and ultimately was taken into the Kamiya dojo, where he and Ashitaro are live-in students.
Son of a Whore: The Big Bad from Ashitarō zenka ari speculates that Alan's mother was one of the prostitutes who made a living out of "pleasing" Westerners in the harbors.
Berserk Button: Wasting food, oh yes. In Ashitarō zenka ari, one of his opponents throws some riceballs that Asahi had tried to use as bribe and Ashitaro gets VERY ANGRY.
Big Eater: As a consequence of his past, one of his biggest traits is how he's always hungry. If not for his unquenchable hunger, he wouldn't have been taken into the Juppongatana.
Black Swords Are Better: Shishio's Mugenjin, which he now posseses, now has a blackened, charred appearance, since the last time we saw it was in Shishio's hands when he and his headquarters burned to the ground.
Dark and Troubled Past: Ashitaro was first an orphan, then a lowly thief, then a low-ranked Child Soldier and errand boy of the Juppongatana, then was jailed for five years after the Juppongatana was disbanded and, before being taken into the dojo, had to cut a deal with the police to stay there. Heck, the guy has Shishio's sword the Mugenjinand he's seen using one of Shishio's techniques, forcing Kenshin to use the Sakabato to stop him. Kenshin himself is seriously worried that, due to his hardships and Shishio's influence, he might become the second Shishio.
Extreme Omnivore: Due to his terrible past, he's capable of eating almost anything. In Ashitarō zenka ari he's seen trying to eat something he pulled from the trash before a squicked-out Alan stops him, and later he also attempts to eat thrown riceballs until Alan stops him again - but now, for the sake of Ashitaro's self-worth.
Flaming Sword: Current wielder of Shishio's Mugenjin, THE flaming sword of the series, which he ended up grabbing as he was escaping from their burning Mt. Hiei base.
In Ashitarō zenka ari he refuses to let go of the Mugenjin because he wants to sell it for a good price, then get nice food... and give the rest of the money to Alan so he can fill his dream and go to the USA. Alan is driven to tears when he hears it.
He got into the HUGE brawl featured in the Hokkaido arc beginning because he tried to help Asahi against her abusive owner and her Bad Boss.
Meaningful Name: His name literally means "Bad Taro" and was given to him by the villagers who's food he used to steal. Later, when joining the Kamiya Dojo, the chararacter for "Ashi" in his name is now changed so that it means "Tomorrow".
Only the Chosen May Wield: Indicated that he was chosen by the Mugenjin, seeing as he was the only one able to draw it out in Ashitarō zenka ari. Kenshin contemplates on whether this was the case and the sword chose him, or if it was he who chose the sword.
Never Learned to Read: Being a former street kid and a Juppongatana really didn't help him get a decent education.
It turns out that he became a member of the Juppongatana after being caught stealing Shishio's food and staying defiant after he was captured and beaten, so Shishio sorta did this to him as well.
Wrong Side of the Tracks: He spent some time in a slum before being jailed, and came back with a not-exactly-thrilled Alan when released to retrieve the Mugenjin, which he had buried there.
Chekhov's Gun: She carries a mysterious envelope... It contains a photo taken in Hokkaido, and the guy featured on it turns out to be... Kaoru's Disappeared Dad Koshijirou Kamiya, who was believed to have died in the Satsuma War.
Dark and Troubled Past: Asahi once was a low-ranked errand girl of the Juppongatana. In fact, the reason she was there was because she was Made a Slave by some shady people who lent her out to Shishio's group before eventually being adopted by Kenshin and Kaoru. Turns out it's even worse, as she was an orphan raised by the remnants of the Yaminobu from the Jinchuu arc. She assumes Kenshin will kill her for the Yaminobu's involvement in Tomoe's death..
The Fashionista: In Hokkaido arc she's seen wearing a very cute hakama and taking pride on how she styled it personally.
Honey Trap: In Ashitarō zenka ari she's forced to try befriending Ashitaro solely to try getting from him a "treasure" that he had found between the Juppongatana's dissolution and being thrown in jail: Shishio's sword Mugenjin.
Made a Slave: Like Tsubame, she was a vassal to rather shady people.
Master, I Don't Want to Fight: Doesn't want to get involved in any more violence and would rather "shine in this new era", which is problematic as the people who took her in as a war orphan are mercernaries who want to sell her services as one. That said, she does know how to fight when she wants to. Ashitaro learns this the hard way when she is able to floor him with ease.
Never Learned to Read: Vital, in her case: she thought that gathering a certain quantity of money would be enough to purchase her freedom, but the real price was much higher and her abusive owner not only didn't disuade her, but wanted to sell her off to a far worse guy. If not for Ashitaro's intervention, who knows what would've happened to her. When she joins the Kamiya dojo, Ashitaro asks Alan to teach her to write/read and Alan happily accepts, on the condition that Ashitaro joins their study sessions.
Offhand Backhand: Asahi's final blow on Ashitaro when he tries to get her to return to the Himura family is an elbow to the gut followed by a backhand to the face.
Recruited from the Gutter: Hokkaido arc has Asahi being rescued from her new "masters" and, like Alan and Ashitaro, being taken in by Kaoru and Kenshin.
Blade Lock: Weaponized with his "San Rendousa" in his battle with Soujirou. He locks blades with his opponent's sword in such a way that the opponent is unable to move due their center of gravity being supressed.
Character Name Alias: Sugimura Yoshie is his Meiji alias. His true identity is Nagakura Shinpachi, former Second Division Captain of the Shinsengumi.
Cool Old Guy: He is the oldest member of the team gathered to fight off the Kenkaku Heiki and he is the most laid-back. He is also the Second Division Captain of the Shinsengumi and as his fight against the much younger and nimble Soujirou shows, age has not slowed him down in the slightest.
Martial Pacifist: States that he is no longer a wolf who follows 'Aku Soku Zan' but instead a dog who doesn't kill.
The Leader: Of the the reinforcements Saitou called for, which include Anji and Soujirou.