Hawkfrost is a light brown tabby tom with a white under-belly and ice blue eyes.
His mother was formerly a kittypet, so he has kittypet blood.
He has been described with both amber and dark blue eyes.
In the alligiances of Midnight, he is described as dark brown.
His father was born in ThunderClan, so he has ThunderClan blood.
In Cats of the Clans, it's mentioned Hawkfrost wanted to take over the Clans even before he knew who his father was, but that's false, because in Return to the Clans, Sasha tells Hawkfrost, and his sister, Mothwing, before they join RiverClan.
In The Sight, he is mentioned as RiverClan deputy when he dies, even though Mistyfoot had already taken back that position.
Sasha, Status Unknown
Mothwing, Living (As of Last Hope)
Tadpole, Deceased, Status Unknown
Brambleclaw, Living, (As of Last Hope)
Tawnypelt, Living (As of Last Hope)