Septarians

Septarians are a race from the show "Star vs the Forces of Evil". There is very little lore about them, except for their incredibly fast regeneration ability, their apparent immortality and their tendency to hold onto grudges. 

Teppet as the main OC has a whole bible of headcanons surrounding him and Septarsis as a whole - including tribes of different Septarians which developed according to the climate they live in.