Echoflight, Sunfire and Firestorm are the last kits of Firestar and Sandstorm before the latter's death in the Battle with the Dark Forest.
Sunfire is a fiery red ginger she-cat with green eyes.
Sunfire was born moons after the great battle with the Dark Forest to Sandstorm and is the sister to Echoflight and Emberheart. Her father, Firestar, died from the great battle.
Sunfire was the first born of Sandstorm's second litter. Despite Emberheart being born after her, Sunfire had left him be the 'big brother' of the group. Having only heard stories about her father, Sunfire admired him with greatness and hoped to one day to live up to his reputation.
- Father: Firestar
- Mother: Sandstorm
- Sisters: Squirrelflight, Leafpool, Echoflight
- Brother: Emberheart
- Niece: Hollyleaf, deceased
- Nephews: Lionblaze, Jayfeather
- Aunt: Princess, status unknown, Firestar's sister
- Grandfathers: Redtail, Jake
- Grandmothers: Brindleface, Nutmeg
- Distant Ancestors: Cloudstar, Birdflight, Gorseclaw, Spottedpelt
- Sunfire was mentored by Bramblestar.
- Sunfire was named after her father, Firestar.
- Sunfire was named due to her looking exactly like her father, Firestar
- Sunfire has kittypet blood, as her father, Firestar, was born a kittypet.
- Sunfire has SkyClan blood, because of her great-aunt Spottedleaf