Cloudtail is a thick-furred, white tom with blue eyes.
- Cloudkit is the firstborn of Firestar's kittypet sister, Princess. He was brought to ThunderClan by Fireheart and raised by a ThunderClan queen, Brindleface.
- His father is unknown.
- He was not given a naming ceremony when he first entered the Clan.
- He caught a vole (althought kits aren't supposed to hunt) while he snuck out to hunt during a snowstorm.
- He was warned by Cinderpelt not to eat deathberries because they could kill a cat.
- Cloudpaw's mentor was Fireheart
- Cloudpaw was tempted by the kittypet life during his training, often eating kittypet food and being friendly with twolegs.
- After he was taken away from the forest life by twolegs, he regretted his decisions, and went back to ThunderClan when Firestar rescued him.
- He was proven to be a good fighter when he fought off a WindClan apprentice by himself and then helped Sandstorm drive off a seasoned warrior after being stuck in a twoleg nest without any practice.
- Cloudtail was the first to become a warrior over all of his denmates, even though some were older and more experienced, because Bluestar only trusted Fireheart and Cloudtail was his apprentice.
- When Brightpaw is fatally injured from the dog pack, Cloudtail stays with her in the medicine den, revealing that he is in love with her.
- His personality is somewhat aggressive and hot-headed, often delighted at the prospect of battle, with Brightheart usually being the only one who can calm him.
- He speaks up to change Lostface's name to Brightheart.
- Cloudtail was born in a twoleg nest.
- He never had a known kittypet name.
- He fought in the battle against the Dark Forest.
- His mother is Princess.
- His daughters are Whitewing and Amberkit.
- His sons are Dewkit and Snowkit.
- His mate is Brightheart.
- Spiderpaw was mistakenly listed as Cloudtail's apprentice when his mentor is Mousefur.
- White cats with blue eyes are easily prone to being deaf, but Cloudtail is not.