Authority Equals Asskicking: She's the chosen queen of a distant land. She's also quite the terror with a sling.
In the Blood: Her father (who, as Skipper of Otters, is a recognized badass in his own right) speculates that the Wildloughs must have been a warrior clan in some distant land. He's absolutely right; Tiria takes after her ancestor, High Queen Rhulain Wildlough.
Legacy Character: Takes on the mantle of High Rhulain of Green Isle, after the original High Queen Rhulain Wildlough.
Missing Mom: Her father mentions her mother briefly to her, saying he wishes she had lived to see Tiria now.
Royals Who Actually Do Something: As the protagonist she joins in on the fight to reclaim the throne of the Green Isle personally.
Suffer the Slings: The only central protagonist to specialize in slings. She never even touches the Sword of Martin.
Took a Level in Badass: At the beginning of the story, she can barely fathom taking the life of another creature, even after witnessing her new friend Pandion being tortured by vermin. By the end of it, she had managed to singlehandedly kill the Big Bad of the book in the space of about four seconds.
Tuckerization: She is based on a fan named Patricia who met Brian Jacques at a Pittsburgh book signing in 2003 and gave him a letter requesting that he name an otter character after her.
Leatho Shellhound
Alone with the Psycho: Twice when he's attacked by Kaltag. The first time she just tries to stab him while he's tied up. The second time, she winds up burning down the whole fortress to get at him.
Conveniently an Orphan: Subversion. It's implied to bother him greatly that he's the last of his clan, but the cave that they used to live in is used as a good hideout for the free clans.
The Heart: Interestingly for such a tough character, he serves as the clans' main source of motivation for continuing their fight against Riggu Felis.
Just Like Robin Hood: Without the stealing part. He terrorizes the cats because they're evil bastards and is frequently referred to as an outlaw, but is easily one of the most heroic characters in the whole series.
Justified Criminal: Labeled as an outlaw for trying to save a bunch of otters who are being kept as slaves by the cats.
La Résistance: He's the unofficial leader of the free otterclans who are fighting to regain Green Isle from the cats.
Last of His Kind: Downplayed; there are plenty of other otters, but he's the last survivor of the Shellhound clan.
Loveable Rogue: He's an outlaw and proud of it, but still a pretty nice guy. Also, it's Riggu Felis's law he's going against.
Make an Example of Them: Has this pulled on him by Riggu Felis after he's captured. He spends all of perhaps a day helpless in a cage, and then with Pandion's help manages to turn the tables quite nicely.
Odd Friendship: With Tiria, after comforting her when she learns of her friend Brinty's murder.
Outlaw: Pretty much the archetypal Western example as branded by Riggu Felis, only he's not in a Western.
Retired Outlaw: As of the downfall of Riggu Felis and the cats. He's now free to just be a normal otter.
Super Not-Drowning Skills: Applied with excellent results in-universe. Being such a good swimmer gives him a wonderful advantage over the cats, who are nearly all hydrophobic.
Big Kolun Galedeep
Famous Ancestor: His last name would imply that he's from the same clan as Finbarr Galedeep of The Bellmaker, but nothing is ever mentioned. Likewise, clans Wavedog and Streambattle are also mentioned, but no news on whether or not they are descendants of Kroova or Rab and Iris either.
Good Parents: He is apparently an excellent father to his ten babies, and loves them dearly.
Happily Married: Despite how fierce his wife is, he is very happy to be with her.
Almighty Mom: She's described by Tiria as being less an ottermum and more of a force of nature. Kolun also remarks that Tiria will probably make her an officer due to how good she is at giving orders.
Happily Married: To Kolun, despite how stern she is with him.
Parenting the Husband: A little, but Kolun is less a manchild than he is just very cheerful and irrepressible.
Banya Streamdog
Cuthbert Blanedale Frunk
Big Eater: When he first shows up, Frunk eats his fill, switches personalities, and then stuffs himself all over again, having apparently forgotten that he'd already eaten.
CloudCuckoolander: However, unlike most other examples in the series, Frunk's cuckooness is due to actual mental illness.
Death Seeker: Actually referred to as such by Badger Lord Mandoral, who suspects that he aims to get himself killed in his wild escapades. If this is the case, he certainly gets his wish in one hell of a way.
Dying Moment of Awesome: Taking out a freaking plesiosaur with nothing but a pike before being drawn into the lake after it. Definitely awesome.
I Have Many Names: He's only Cuthbert Blanedale Frunk when he's a Long Patrol major. Frunk uses a different name for each of his multiple personalities, including the Guosim shrew Log-a-Log Boodul, sea otter pirate captain Cuthbert Frunk W. Bloodpaw, and the badger Lord Brockfang Frunk - and, as Tiria suspects, that's probably not all of them.
Majorly Awesome: Single-handedly taking down a crew of rats, ploughing through an army of cats, and killing a Stock Ness Monster? Awesome indeed.
One-Man Army: Takes out a whole crew of searats in the backstory, and fights his way through an army of wildcats in the main story to get at Pitru.
Papa Wolf: A rather heartbreaking version. When his daughter was slain by searats, he went after them and slaughtered them all.
Badass in Distress: Starts the book as one: he gets wounded by Riggu Felis and his sons, blown away from Green Isle by a violent storm, and then gets caught and tortured by Groffgut's gang due to being too weak to resist.
The Dog Bites Back: Riggu Felis, Pitru, and Jeefra attempted to kill him for sport, and actually lodged an iron star-shaped missile in his beak. In retaliation, he destroyed Felis' face.
Noble Bird of Prey: He's an osprey and is very fierce and warlike. He was also the one to destroy Riggu Felis' face, by way of latching on to him there with his talons and lifting the wildcat up until the skin simply couldn't handle the weight any longer and tore.
Brantalis
Funny Foreigner: Talks in an odd accent but is at least intelligible.
High Queen Rhulain Wildlough
The High Queen: She's certainly more fondly regarded than the wildcats that killed her and took over Green Isle, that's for sure.
Last Stand: She didn't have a hope of defeating the wildcats attacking her ship, but at least she went down swinging.
Even Evil Has Loved Ones: He seems to genuinely care about Atunra in return for her Undying Loyalty, and when she dies, he vows to find her killer and make him pay. As Yund eventually, horrifically, finds out.
Facial Horror: Attention is called to the fact that the lower half of his face is gone.
Hated by All: His catguards don't like him. Even his wife is in complete contempt of him! The only one who genuinely seemed to care for him was Atunra, who was loyal to a fault.
Misplaced Retribution: Pandion was long gone, so Felis made do with all the other birds.
Pretty Little Headshots: When he's killed, the narration notes that there's just a hole between his eyes.
Revenge: Is unique among Redwall villains with vendettas against the good guys in that he manages to exact his revenge.
Revenge Before Reason: He drops everything else during the final confrontation between himself and the otterclans because he just so happened to recognize Pandion as the one who'd wrecked his face. Rather than stay back where it was safe, he ran out to the edge of the pier and hurled his axe at Pandion, killing him instantly. However, his close proximity just allowed Tiria to have that much better a shot at him.
Cats Are Mean: Disrespects his father, murders his own brother, and berates his henchmen? Fits the bill.
Dirty Coward: As quick to hide behind his mother's skirts as Jeefra whenever he thinks that Riggu Felis seriously intends to fight him.
Food Slap: He smashes a gull egg over Jeefra's head just to drive home the point how inferior Jeefra is in comparison to him.
General Failure: Pitru certainly didn't get his decision-making skills from his father. Riggu Felis all but facepalms when he sees Pitru's idea of a defense: all of the guards inside the fortress, and all of the otter slaves camped outside it.
Nice Job Fixing It, Villain: Riggu Felis might have succeeded in his war against the otters if Pitru hadn't constantly taken matters into his own hands. Murdering his brother drove his mother insane and resulted in her burning down the tower, murdering Atunra deprived Riggu of a valuable advisor and temperance, and then he abandoned the fortress with a group of catguards right when the Otters' assault began.
Smug Snake: He talks a big game but very few of his schemes are actually smart, and he tends to panic when things start going south.
Dirty Coward: Despite being a son of Riggu Felis, he's a cowardly crybaby.
Like Father, Unlike Son: Riggu Felis is a fearsome warlord. Jeefra is, for want of a better term, a pussy.
Mama's Boy: He's very quick to run to his mother, who's clearly spoiled him rotten, when things don't go his way or when his brother picks on him.
Plot-Triggering Death: His death is what causes his mother Kaltag to go crazy and tensions to really get going between Riggu Felis and Pitru.
Super Drowning Skills: A lack of knowledge on how to swim coupled with being smacked over the head with an oar by his brother Pitru heavily contribute to his death.
Brinty
Badass Normal: He's just a regular Redwaller who doesn't really stand out from the others, yet he manages to beat the leader of a gang of water rats to a pulp with his staff, and almost kills him until Tiria stops him.
Beware the Nice Ones: Generally, he's quite kindhearted, but when witnessing Groffgut's cruelty towards Pandion he nearly beats the rat to death. Tiria even lampshades this after the fact.
Dropped a Bridge on Him: Gets unceremoniously slashed to death by Groffgut, who, up until this point, had been Put on a Bus and was presumably nowhere near Redwall.
Dying Moment of Awesome: Immediately before his death, Brinty helps the Redwallers shove a gannet out of the gates. Then Groffgut comes out of nowhere and cuts him down.
Pay Evil unto Evil: Subverted. Brinty almost killed Groffgut in a fit of rage, but Tiria snaps him out of it. Unfortunately, he ends up dying because of this when Groffgut kills him later on in the book.
Too Good for This Sinful Earth: He wanted to be a warrior, but couldn't find it in his heart to take another creature's life, even when he had the opportunity to slay Groffgut for what some Redwallers would've seen as a justifiable reason. He ironically ends up dying because he didn't slay Groffgut.
Groffgut
Bad Boss: He reacts with violence basically every time one of his gang opens their mouth. Heck, he holds the position of gang leader by virtue of having the worst temper.
Big Bad Wannabe: He wants to be a feared vermin horde leader... with a gang of seven rats under his command, which got beaten up by Tiria pretty much single-handedly.
Hate Sink: He's not the Big Bad of the story - that would be Riggu Felis - but he's certainly every bit as loathesome.
It's Personal: After being bludgeoned almost to death by Brinty, who had to be restrained from actually killing him, he vows revenge on the mouse. He gets it, if only for a fleeting moment.
Revenge Before Reason: He goes after Brinty by himself in full view of about a dozen Redwallers. While he succeeds in killing Brinty, Groffgut himself is killed by Banjon barely a second later.
But considering that he lost his daughter, who can blame him?