Kadeptians were the native species of the planet Kadept.
They had long legs, which the Twelfth Doctor compared to that of a grasshopper. Kadeptians had the ability to charm other species, making most of them take jobs such as lawyers, IT and call centre representatives, and accountants. Jack was a Kadeptian. (PROSE: Big Bang Generation)
They had pointed chins, glowing red eyes and pointed 'Spock' ears, traits marked as distinct. Their eyes and ears were more sensitive than those of a human's. (AUDIO: Judgement Day) (PROSE: Big Bang Generation)
Kadeptians had a little bit of venom in each kiss that anaesthetised whoever they kissed. This also meant they could not eat doughnuts. Due to high gravity on Kadept and their natural build, in Earthlike conditions they could jump 365 feet in the air, in addition to belching fire. (AUDIO: Judgement Day)
Their tears were non-saline. (AUDIO: Many Happy Returns)
They lived in extended family units and all shared similar first names, instead of surnames. (AUDIO: The Curse of Fenman) (PROSE: Big Bang Generation)