The Hath Family
- Badass Family
- Brother–Sister Team: Kestrel and Bowman, quite obviously.
- Parents Know Their Children
- Screw the Rules, I'm Doing What's Right!
- Action Girl
- Badass Adorable: She, Bowman and Mumpo all slot into this trope in The Wind Singer.
- Be Yourself: A major reason in a plucky ten year-old kid taking on the repressive authority.
- Berserk Button: Harming Bowman won't earn you any brownie points with her.
- Big Damn Heroes: Her Heroic Sacrifice at the end of Firesong.
- Eerie Pale-Skinned Brunette
- Emo Teen: She is introduced as this in Slaves of the Mastery. Even after Aramanth reforms its ways, Kestrel is contented with her strangeness. Dressing entirely in black, she makes an effort NOT to fit in.
- Good Is Not Soft
- Go Out with a Smile
- The Heroine
- Hot-Blooded: Not as much as her mother or her sister, but she definitely serves to contrast her brother.
- Jerk with a Heart of Gold: She certainly comes across as this at times.
- Little Miss Badass
- Little Miss Snarker
- Mouthy Kid: In The Wind Singer, the only adults to listen to her opinions are her parents. This doesn't stop her from making them anyway, despite the consequences.
- Not Good with People: Contrasting her brother, The Empath.
- One of the Boys: So much so that she fails to comprehend Sisi's morning regime.
- Plucky Girl
- Teens Are Monsters: Compare "Slaves of the Mastery" Kestrel with "The Wind Singer" Kestrel.
- Twin Telepathy: Severed over long distances.
- The Atoner
- Babies Ever After
- Beware the Nice Ones: "I will destroy you."
- Berserk Button: Harming any member of his family will ensure your doom.
- Break the Cutie: Be warned. He doesn't get entirely better.
- The Chosen One: Or rather, that's what everyone thinks.
- Clueless Chick Magnet: For a while. Sisi makes it her business to clue him in.
- Eerie Pale-Skinned Brunette
- The Empath
- Happily Married: To Sisi in Firesong's epilogue.
- Hurting Hero
- Pretty Boy: Sisi certainly seems to think so.
- Pure Energy / Soul Power
- Twin Telepathy: Contributes to the plot majorly, more so in Slaves of the Mastery and Firesong.
- Two Siblings In One: After Kestrel's Heroic Sacrifice, Bowman absorbs her spirit. Like a sponge.
- Good Parents: With Hanno to Bowman, Kestrel and Pinto.
- Hair-Trigger Temper
- Happily Married: To Hanno.
- Killed Off for Real: A Tear Jerker.
- Mama Bear
- Badass Bookworm
- Good Parents: With Ira to Bowman, Kestrel and Pinto.
- Parental Favoritism: Grandparental Favoritism. His favorite grandchild is Falcon. However, this may be because his dead daughter was also named after a bird of prey.
- Happily Married: To Ira.
- Open-Minded Parent: Understands and empathizes with Kestrel's angst in The Wind Singer, encouraging her to stay true to her beliefs.
- So Proud of You: He has at least one moment like this with each of his children.
- Berserk Button: Just try calling her Pin-Pin past her toddler days. Just try.
- Embarrassing Nickname: The aforementioned 'Pin-Pin'.
- Huge Guy, Tiny Girl: The Tiny Girl to Mumpo's Huge Guy.
- I Miss Mom
- Wise Beyond Her Years
- Childhood Friend Romance: He adores Kestrel. His love goes unrequited.
- Friendless Background: He had no friends until he found Kess and Bo.
- Huge Guy, Tiny Girl: The Huge Guy to Pinto's Tiny Girl.
- Kids Are Cruel: He tells Bowman that he wants his first born son to be called Mumpo and to have lots of friends - the friends he never had as a young child.
- The Load: He is this in The Wind Singer, but oh how times change...
- Parental Neglect: He got dumped by his parents as a kid. In the finale of The Wind Singer, we discover his father is Maslo Inch. Big surprise. Not.
- Settle for Sibling
- Too Dumb to Live: He can come across as this, especially in the first book. However, his incompetence dulls considerably from book two onward.
- Took a Level in Badass: Does the manaxa ring a bell?
- Troubled, but Cute
- Disc-One Final Boss: In The Wind Singer.
- Jerkass: Until the finale.
- The Reveal: He's Mumpo's father.
- Sudden Sequel Death Syndrome: He is burned to death in one of the early chapters of Slaves Of The Mastery.
- Badass Boast
- Captain Obvious
- Everything's Better with Princesses
- Innocently Insensitive: Dear God, she personifies the trope.
- Lonely Rich Kid
- Naïve Newcomer: To the Manth group. Kestrel lampshades this constantly.
- No Social Skills: She'll threaten to have your eyes gouged out and think it's a perfectly natural way of initiating conversation.
- Plucky Girl
- Sheltered Aristocrat
- Shout-Out: Possibly named after Empress Elisabeth "Sisi" of Austria.
- Single-Target Sexuality: See how she goes after Bowman?