Adderfang is a dark brown tabby tom with yellow eyes.
- Adderfang is first seen as a senior warrior of ThunderClan.
- He is mate to Swiftbreeze, and the father of two kits, Leopardkit and Patchkit.
- He is seen play-fighting with his kits, while Bluekit longingly wishes her own father, Stormtail, was as good a father to her as Adderfang was to his kits.
- Little is known about how Adderfang died, but he died some time between Bluestar's Prophecy and Into the Wild.
- At the end of The Last Hope, he is seen very briefly when Jayfeather reunites StarClan.
- Adderfang fought in a couple battles against RiverClan for Sunningrocks, though most of them weren't noted.
- He fought in the battle(s) against WindClan.
- His mate is Swiftbreeze.
- His sons are Patchpelt and Redtail.
- His daughters are Leopardfoot, Spottedleaf, and Willowpelt.