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This is the defining trait of Alanna in . She's a Song of the Lioness Fiery Redhead with a Hair-Trigger Temper who will be a knight no matter what. A lot of her Character Development is about tempering her hotbloodedness so it's not a Fatal Flaw.
Kristy in .
The Baby-Sitters Club FŽanor ("Spirit of Fire") in , whose body cremated itself when he died.
The Silmarillion In fact, the tale of the Silmarils is caused by his hot blood and burning soul. The spontaneous combustion is just the tip of the magma vein. (I'd say iceberg, but... uh, it doesn't seem suitable.)
A villainous example: Couladin from , in the The Wheel of Time The Shadow Rising you only see him calm in only a few paragraphs and those are always followed by him raging against something. This is all the more notable because the Aiel in general are extremely in control of their emotions. Mat idly wonders at one moment how Couladin managed to live for as long as he did among them, let alone become a prospective Clan Chief.
And Perrin becomes this trope when Faile gets kidnapped by Aiel later in the series.
Don Quixote was pretty Hot-Blooded; he even gave speeches extolling giving it your all and never giving up, and doing this through force of arms.
Miles from the can be like this, especially as his alter ego Admiral Naismith.
Vorkosigan Saga King Robert Baratheon from should qualify for this as well, especially in his youth.
A Song of Ice and Fire Lyanna and Brandon Stark were described by Ned as having the "wolf's blood".
Mortal Instruments Richard Rahl of the series.
Sword of Truth Harry Dresden.
Prince Aljan, the unicorn protagonist from Meredith Ann Pierce's .
The Firebringer Trilogy Ron Weasley, and probably Sirius Black. Hagrid had some moments, too.
As well as Harry himself, particularly during the fifth book. And also Ginny Weasley.
In the Weasley family, this seems to be a genetic trait.
Anne of Green Gables throughout the first book.
Phaethon from John C. Wright's ( The Golden Age Meaningful Name). At one point he starts a defiant speech to a private enemy, only to realize that the gesture of raising a clenched fist accidentally activated the public channel...
From The Bible, Judge Samson was a Hot-Blooded World's Strongest Man who killed a thousand Philistines with the jawbone of an ass. After a deadly Humiliation Conga that involved a certain seductress, a Traumatic Haircut and Eye Scream, took down thousands more with him by breaking the pillars of a temple. .
Epic Deconstructed with Foxleap in . He always tries to rise to every challenge, which one time resulted in the main characters having to pull him away from a fight because they were on a journey and needed to conserve energy. Eventually, Warrior Cats he jumps to the aid of some cats fighting an eagle when told to stay back, causing one of the cats to have to rescue him and dying in the process.
Loads of examples in the series, particularly the American girls, Chalet School Simone Lecoutier and Betty Wynne-Davies. Joey is the most prominent example, and her temper gets her into trouble more than a few times, though she (for the most part) calms down as she gets older. Her daughter Margot also has some anger management issues - she refers to her temper as 'my demon', and it gets her into major trouble in Theodora at the Chalet School, culminating in Len slapping her and her dad refusing to speak to her for two weeks. After that, she learns her lesson and tries her damnedest to control it.
gives us Matteo, who Someone Else's War yells at everyone but his elders, charges headfirst into danger without a split second's thought, and is damned near indestructible in his resolve.
Lucy Pennykettle from The Last Dragon Chronicles.