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Scarlet was insane and murderous, and other dragons very rarely argued with her.[24] Living in excess, Scarlet took pleasure in adorning herself and her throne room with gemstones and precious metals, and would grow petulantly upset when she did not get her way.[9][25] She thought very highly of herself, and had portraits made in her image.[26] She was not above lying and manipulation, and would go to great lengths to control dragons around her to do her bidding, particularly Peril.[27][28][29] She was a smooth liar, sly and cunning with her words,[30] as well as ruthless and unbothered by killing or having dragons killed, including her own daughters.[31] She used fear of her violent wrath to prevent her subjects from doing things she disliked,[32] and she rarely lost challenges to her authority.[33] Chameleon also stated that she was usually very convincing.[34] She rarely trusted other dragons,[15] and Moonwatcher described her mind as loud, angry, and all over the place. Ruby described her as "The Super-Murdery Queen of the Mountains."[35]

Her self-indulgent need for 'thrilling' forms of entertainment meant that her violent arena, fed by the war, was very important to her.[36] She wished to continue the war, heedless of its impact on her subjects, for her personal entertainment and to keep her throne secure.[37] She also kept a close hold on Peril, her arena champion, who was encouraged to draw out battles for Scarlet's entertainment.[38]

After being scarred by Glory's venom, she grew more bitter and vicious, plotting vengeance and violence against the dragonets of destiny, Princess Burn, and her successor, Queen Ruby.[39] She was less confident[40] and more willing to let other dragons kill the dragonets of destiny for her.[41]

She was shown to be opportunistic, taking advantage of what Chameleon could do very early on.[42] She also seemed to find it amusing and easy to manipulate Peril, despite the latter wanting to kill her. When changing dragons with the jewelry Chameleon provided, she put loyalty to her as one of the first criteria most of the time, showing how she expects all her subjects to feel the same.