Please be aware that "Nekoda" refers to the group called the Nekoda headed by the Arelim, as well as the character Nekoda Kennedy, who is a member of the Nekoda.
The Nekoda are beings that serve the Arelim. They are chosen from the souls of the dead much like Dark-Hunters. The Nekoda are given physical bodies even though they are technically spirits and are susceptible to wards to trap or contain spirits.
The only known Nekoda is Belam, who gave up her name upon being granted her mission by the Arelim.