Breed: Akita/Kishu mix
Voiced by: Sachi Kokuryu
The protagonist and Gin's son.
- Amazing Technicolor Dog: He is blue, but this is probably just meant to be stylized gray.
- Berserker Tears: Happens at times when he is in a rage.
- Beware the Nice Ones: Weed is the most polite and the nicest puppy but if you mess with him, you are seriously in big trouble.
- Broken Aesop: While his sympathy and "if you kill them you're just like them" philosophy is arguably the biggest Aesop in the anime. Even after Hougen proves himself irredeemable time and time again, Weed refuses to kill him or allow any of his followers to kill. He even tackles Gin to rescue Hougen from execution. This is the reason Jerome goes off on his own and Kyoushiro almost follows him. However, after Hougen declares himself king of Gajō because Gin refuses to kill him, he gets struck by lightning and the narrator explains that the gods have passed judgment, implying the even gods themselves recognize that Hougen just needs to die. What.
- Weed's moral isn't "Never kill, ever" but "Only kill as a last resort". What sets him off is when he sees someone, even a villain, about to be killed when he's already been defeated or has no means of defending himself. The anime makes this confusing however with Hougen's lightning death, when he's originally killed by a vengeful hunter in the manga.
- Call-Back: The part where he gets pissed off at Jerome for killing Thunder and Lector while they were defenseless is reminiscent of the Nagareboshi Gin episode where John killed two defenseless bear cubs right in front of Gin, which pissed him off. What brings it more home is that even the same dog breeds are used (Gin and Weed = Akita, John and Jerome = German Shepherd).
- Combat by Champion: Weed vs. Hougen
- Generation Xerox: He's a dead ringer for dear old Dad.
- Glowing Eyes of Doom: When he unleashes his battōga.
- Heroic Lineage: Weed comes from a line of badass bearhounds. Because of this, he is a powerful fighter even when he had no experience or training whatsoever and is among the very few dogs who can preform the battōga, which was originally a wolf's attack.
- Heroic Second Wind: He's badly beaten by Hougen at their fight and nearly dies, yet manages to stand up again after being encouraged by the spirits of past Ohu soldiers.
- Hot-Blooded: He's this by definition.
- If You Kill Him, You Will Be Just Like Him: His often-invoked argument to his subordinates.
- Incorruptible Pure Pureness: As Jerome lampshades, "Weed, your spirit is too pure."
- Informed Attribute: He's stated to be "tora-ge" (tiger-striped, i.e. brindle), but much like his father Gin whose stripes disappeared after three episodes, Weed bears no visible stripes.
- In the Blood: Inherits natural strength from his father the way Gin did from Riki.
- Intimate Healing: When his group finds him nearly having frozen to death in a river they help him get warm again by making a huddle around him.
- Japanese Politeness: Like his father, Weed epitomizes this trope.
- Pup Hero: Is extremely powerful and supposedly wise for his age.
- Lawful Stupid, Chaotic Stupid: Oh boy...Weed and his morals.
- Leitmotif: His acoustic theme during lectures is about the only subtle one in the series.
- Luke, You Are My Father: He pulls this on "Gin" in Kaibutsu Arc, who is actually a substitute called Tokimune and he doesn't have a clue what the puppy is talking about before he dies.
- Mood Whiplash / Forgotten Fallen Friend: Weed gets over the death of his mother extremely fast. Weirdly, he mourns more when John dies, and he didn't even know the guy.
- Not Too Dead to Save the Day: During the final battle, Weed was beaten to the point of death by Hougen that Gin could not help his son but to shed tears in defeat. Just when Weed's friends rush to fight Hougen, Weed suddenly rises up from the dead with the help of the ghosts of Ōu soldiers. This scared Hougen so much that Weed took his advantage to defeat him with his final battōga.
- One-Man Army: He's seen as a one puppy army in the anime opening.
- Parental Abandonment: Sakura, Weed's mom, dies in the first episode, leaving Weed in the care of some of his father's old friends.
- Passing the Torch: Gin makes Weed the new leader after he's defeated Hougen and given a Rousing Speech about the power of kindness.
- Pint-Sized Powerhouse: He's the best example of this in the series.
- Save the Villain: In the second episode, Weed tries to save Blue from getting hit by a truck. In episode 16, he tries to stop Jerome from killing both of the doberman brothers.
- Stupid Good: He is adamant to Save the Villain no matter how many dogs they kicked. He gets called out on this in-universe more than once, specially after banishing Jerome, to which Kyoshiro chews him out for being too naive and he should accept that taking lives is part of a war. Weed is confident that he's right however, and states that his beliefs won't change even if he should end up alone with them.
- Talking Is a Free Action: Episode 3 has a especially ridiculous example. Weed and the other dogs blabber on and on, and Kaibutsu even has time to turn around and prepare to attack, while Weed is in mid air. He was not near far enough away before he jumped for them to have done and said all that. He had to have just floated there or flew slowly or something, despite the action lines that seem to indicate he's moving at a fast speed through the air.
- Thou Shalt Not Kill: Somewhat zig-zagged with him as he is willing to kill an enemy in self-defense or otherwise when it's the last way out, but killing someone who's defenseless and/or are pleading for their lives is a major Berserk Button for him, to the point he even refuses to kill the Big Bad when the latter's been wounded so badly he can hardly stand, and lectures his father and everyone present for wanting to do so.
- Took a Level in Badass: Throughout his series.
- Wise Beyond Their Years: Is supposed to be this, though to most of the audience he comes across as being overly nice to the point where he makes bad decisions like letting dogs that want to kill him live.
- Babies Ever After: With Koyuki at the end of the manga.
- Busman's Holiday: He tried to have a honeymoon vacation with Koyuki but it was interrupted when his close friends brought the news to him about his father fighting Victor in Hokkaido.
- Died in Your Arms Tonight: In the manga, the dying GB asks for Weed to hug him. Needless to say, his wish is fulfilled, and GB dies as Weed is still embracing him in what is a massive Tear Jerker.
- Plot Armor: Near the beginning of the manga, Weed gets shot. A lot (there were at least 34 bullets in him, according to a later scene). Not only is he back on his feet after a few days, but he is also showing absolutely no signs of being shot over thirty freaking times afterwards. Did I already mention that the protagonist in question is a months old puppy? No wonder the anime took this out.
Breed: German Shepherd
Voiced by: Masaya Takatsuka
A powerful ally of Weed.
- Death by Adaptation: Dies in the anime, but is still alive and kicking in the manga.
- Hypercompetent Sidekick: He's one of most competent dogs of Weed's pack until he was banished by his leader after killing Lecter and Thunder.
- Though in the manga, he came back from his banishment after Murder S' defeat and remains as Weed's hypercompetent sidekick.
- Kick the Son of a Bitch: He mercilessly kills Thunder and Lector after they plan on attempting to murder Weed a third time. Unfortunately, his act of killing them while they're defenseless does not go over well with Weed.
- My Master, Right or Wrong: Oh lord, Jerome. In episode 5 he informs Kaibutsu how wrong the latter was to attack and flee from the humans that had been torturing him for 5 years because "it's a dog's duty to obey his master and endure any pain he should put you through." ...what? Oddly enough he then averts this at the beginning of episode 6 where he "tells" the humans about to land with a helicopter that he won't obey to their cruel ways anymore and that they should stay away, or he'll attack them the minute they set foot on the ground.
- He epitomizes this trope after he accepts Weed as his leader. Even when he kills Thunder and Lector in the anime, he tells Weed that he did it for him, agrees that he did something wrong even though he thought it was right only a few seconds ago, is willfully exiled, and even tells Kyoushiro to go back to Weed when he follows him.
- Suicide Attack: When he and his comrades are fighting Kaibutsu, whose tactic consists of charging him one by one and bite into his chest, where his heart is located. Doing so, Kaibutsu will pull them off, killing them in the process, but not without them using his own force to rip parts of his chest out, leaving more and more access to his heart for the next attacker. By the time it's Jerome's turn, he reaches all the way in to his heart, however, ends up letting go as his injuries are too great. Although the attack does give Weed's group the opportunity to off Kaibutsu themselves, having progressively slowed him down and weakened him.
- 10-Minute Retirement: When he's banished by Weed after he killed the Foxhound Spies, several dogs such as Kyoushiro, George and Ron called it quits and decided to join Jerome. However, they later went back to Weed after Jerome told them off that it wasn't necessary.
Breed: English Setter
Voiced by: Naru KawamotoA selfish dog that had a change of heart. He was one of the first dogs to join Weed's pack and was the one who named Weed.
- Cowardly Lion
- Crouching Moron, Hidden Badass
- Jerk with a Heart of Gold
- Lovable Coward: Emphasis on the lovable.
- Only Known by Initials: His full name is Great Britain. Of course, nobody ever calls him that.
- Took a Level in Badass In the manga, he took a huge level of badass when he rips off Hybrid Bear's claw before dying completely.
Voiced by: Yuuki Masuda
A very Young, but powerful dog. He leads a pack of dogs that were abused by their parents. Weed seeks him out in hopes of getting him to join his pack, but they start off on the wrong foot.
- Abusive Parents: Kyōshirō's main motivation for learning how to fight.
- Fake Defector: He pretended to betray the Ōu Soldiers so that he could inflitrate Gajō to find out about Hougen's plans but it didn't go as planned...
- Heroic Second Wind: When he is fighting Buruge, he appears to be defeated and about to die, but Toube's ghost speaks to him and Kyōshirō finds the strength within to keep fighting.
- Jerk with a Heart of Gold
- Pet the Dog: Gets one with the pup he adopts, named Teru.
- Rugged Scars: Is covered with them. How he got them is never told, but one can assume either has been fighting a lot all his life or they're from his father, or both.
- Well-Intentioned Extremist: When he first shows up he makes a living by beating and sometimes killing parents he finds abusing their children, as a payback for having had an abusive father himself.
- 10-Minute Retirement: Was among the dogs who tried to Join Jerome when he was banished.
Breed: Great Pyrenees
Voiced by: Kenji Nomura
A former loner who joins Weed's pack.
- Badass in Distress: The tough-as-nails loner gets captured by Hougen while defending Reika.
- Big Guy
- Cruel Mercy: He inflicts one on Kamakiri after defeating him. He lets him live, but without fangs or testicles.
- Groin Attack: His specialty, though he does not do it very much in the Anime.
- Large Ham: To a certain extent.
- Rugged Scar: Has one over his eye.
- You Killed My Father: Happens to poor Hiro when Kamakiri killed his father as a puppy.
- Anthropomorphic Shift: He's one of the main culprits of this in the comedic moments.
- Boisterous Bruiser: Plays this trope straight in the manga more than the anime.
- Bratty Half-Pint: His puppies.
- Eye Scream: Happens to him in a flashback.
- Ugly Guy Pretty Mate: With Reika.
Breed: Akita Inu
Voiced by: Rie NakagawaA former pet dog. She is one of the few female characters.
- The Chick: So very much. She doesn't miss out on a Crowning Moment, though.
- Damsel in Distress: Being one is pretty much her entire purpose as a character.
- I Have You Now, My Pretty: Hougen takes her hostage in order to blackmail Gin and John into letting themselves get caught (and beaten half to death). Later he tells her he intends to keep her captured because he wants her as his mate and she's gonna give birth to his offspring. Poor Reika is terrified.
Breed: Mutant of unknown origin.
Voiced by: Kong Kuwata
The starter-antagonist of the series, he was a tortured lab dog that eventually escaped and went mad.
- Alas, Poor Villain: Was revealed to look and behave like he did because he was tortured for 5 years by humans using him for scientific experiments.
- Animal Testing: His backstory and how he became what he is (just what were they testing on him?)
- Attack of the Killer Whatever: Is by far the biggest "dog" in the series.
- Being Tortured Makes You Evil: He was a tortured lab dog.
- Berserk Button: Do not call Kaibutsu by his lab name, "P4".
- Canis Major: According to the guidebook, he weighs at around 1200 pounds.
- David vs. Goliath: Every battle with him becomes this.
- Death by Falling Over: He was finally defeated by Weed, Ken and Kagetora who pushed him off the cliff and got himself impaled by a sharp branch from the log in the middle of a waterfall.
- Disc-One Final Boss
- Evil Former Friend: To Jerome.
- Evil Sounds Deep: Coupled with Guttural Growler, his voice is quite deep and menacing. It might be partially thanks to his mutation.
- Humans Are Bastards: A central theme in his Back Story.
- Impaled with Extreme Prejudice: He finally dies from being impaled by a sharp branch on a log.
- Irony: Kaibutsu, a giant, insane mutant dog is defeated after roughly three episodes. Hougen, a regular Great Dane serves as the Big Bad for the rest of the series.
- Mix-and-Match Critter
- Monster Sob Story
- Shaped Like Itself: His name means "monster".
- Woobie, Destroyer of Worlds
Breed: Great Dane.
Voiced by Kôji Ishii
A vicious, sociopathic dog who strives to take over Gin's territory through any means necessary. He becomes the main antagonist of the series.
- The Caligula
- Cold-Blooded Torture: He tortures poor Gin and John during their captivity.
- Even Evil Has Loved Ones: For all his evil, he did love his brother Genba, mercy killing him (see below), shedding a tear while doing so.
- From Nobody to Nightmare: He and Genba were just a pair of poor Great Danes which were locked up and abandoned in the run-down kennel. With months of starvation, fighting and cannibalizing other dogs, they later killed their owner and broke free which then later they became the most feared rogue dogs.
- Humans Are Bastards: His motivation.
- Jerk with a Heart of Jerk: Towards the ending there's a scene where he, Jerome and Reika are being swept through a river. To Jerome's surprise he sees Hougen grab Reika and pull her towards the shore as if he intends to save her, however it turns out he was only going to use her as a stepping object to help himself get out of the water.
- Karmic Death: Killed by lightning at the end of the anime (while shot by a vengeful hunter in the manga).
- Kick the Dog: Let's just say that he does this about once per episode
- Large and in Charge
- Literal Maneater: They flat-out ate their abusive owner before running off into the wild.
- Mercy Kill: When Genba was heavily-wounded, paralyzed and gone insane from the damage by Tesshin (and in the anime's case, Shigure), Hougen had to mercy-kill his own brother by snapping his neck (in the manga, Hougen bit his brother's head and tore his whole brain out).]]
- Nobody Poops: Averted. When he first meets Gin, he kindly introduces himself before abruptly defecating right in front of him. And then he dares Gin to eat his shit.
- Not Quite Dead: Pulls this off WAY too many times. It is rather pitiful that while a gigantic monstrous demon bear is taken down after one hit with a battōga, Hougen doesn't bite it until roughly THREE battōgas and a direct lightning strike.
- Oh, Crap!: The look on his face when he sees Weed performing the battōga attack for the first time.
- Rasputinian Death: To a degree. In both anime and manga, he takes several hits of Weed's Battouga, though thanks to them not being delivered with full force he recovers each time. Even when Weed finally manages a full forced blow to his head which causes his skull to crack, he still manages to stand up after a few moments and climbs all the way to the top of Gajou. It finally takes a well placed lightning bolt (presumably created by the past Ohu soldiers' ghosts) to end him. In the manga, he stands up after the same grievous injury as well, though he's more clearly shown to have completely lost his sanity and is simply having a "death walk" with his last bit of strength, until Shouji appears and blows his brains out.
- You Have Failed Me: He and his allies are not merciful when someone screws up (screwing up here having the meaning of being in any way connected to a bad incident).
Voiced by: Takeshi Maeda
Starts of as The Mole of Weeds Group, until he eventually has a change of heart.
- HeelFace Turn: Probably the most memorable example in the show.
- Nice Guy: After his change of heart.
- The Quiet One
- Theme Naming: He and his brothers are named after the speeding machines.
- Welcome Back, Traitor: Rocket kind of gets this after he joins Weed's group.
Voiced by: Dai Matsumoto
A dog fighting champion.
- Quirky Miniboss Squad: With Batto, Kite, and Buruge.
- Redemption Equals Death
- Snow Means Death: Toube freezes to death after fighting Kamikiri and his pack. The next day, the Ohu soldiers find him... literally frozen to death.
- What the Hell Are You?: Kamikiri and his dogs had nearly beaten him to death and leave his body there. But when Toube gets up, Kamikiri has a look of shock on his face, and he says this almost every word-for-word:Kamikiri: What the hell is he?!
Lector and Thunder
Breed: Doberman Pinscher
Voiced by: Teruaki Ogawa and Susumu Akagi respectively.
An assassin duo.
- Death by Adaptation / Asshole Victim: Both are killed by Jerome, in direct defiance of Weed's orders.,
- Dog Stereotype: Both are evil, as dobermans tend to be in media.
Breed: Irish wolfhound
An Irish wolfhound who combines his own pack with Hougen's pack.
- But for Me, It Was Tuesday: When Hiro reminds Kamakiri about how the latter killed his father in front of him, the wolfhound merely retorts that he doesn't remember.
- The Dragon: He becomes this to Hougen after Genba's death.
- Karmic Death: He suffers a nasty Groin Attack from Hiro and gets his fangs torn out, leaving him a sobbing and bleeding wreck.
- Meaningful Name: His name means "praying mantis", and his introduction scene is ambushing Rocket while he isn't looking.
- Villainous Breakdown: Castrated and defanged, Kamakiri tries attacking Hiro while the latter is leaving, but since he doesn't have fangs anymore, he only leaves a bloody smear on Hiro's fur. He's left sobbing and howling as the crows move in for the feast.
- Domestic Abuse: It's shown in Ginga Densetsu Weed: Orion that he's been a pretty crappy mate, flat-out mauling his mate in front of their puppies.
Breed: German ShepherdA villainous female Russian Army Dog.
- Adapted Out
- Babies Ever After: With Jerome.
- Faux Action Girl
- High-HeelFace Turn: After she falls in love with Jerome.
- Tertiary Sexual Characteristics: The markings on her face are in the shape of a heart.
Breed: Great Dane/Saluki mixBen and Cross's son.
- Adapted Out
- Aloof Big Brother: He is cynical, sarcastic and aloof, but it's subverted in that he is not an older brother, he is the middle sibling.
- Big Brother Instinct
- Chuck Cunningham Syndrome: He really should have made a appearance or at least got a mention in the anime to avoid this because his brother is there, leaving his absence unexplained.
- Dog Stereotype: Subverted. He is a feminine looking dog, but is male.
- Lightning Bruiser: He may look weak, but unlike his Great Dane-mix brother Ken, he is not only fast but also has his father's strength.
- Rugged Scars: Is covered with them.
- 10-Minute Retirement: Is among the dogs who attempted to join Jerome after he was banished.
- Why Did It Have to Be Snakes?: His fear of water.