I decided to create a race with characteristics of a naga and humanoid. This will be a Pathfinder advanced player race with average to advanced RP.
I will be taking my information from recorded legends of this race. One of my major points will be that the serpent races are all related so will be considered one race, that is separated by clan/caste. (ex: naga, yuan-ti, serpentfolk, maralith, lamia, etc). Nobles will be able to shift to full human or any stage in between.

​Deva-Nagaru (People of the Snake)
Before the Chaos Wars, Naga were a serpent worshiping mountain tribe that lived on Nagloka (Nagpur). When the war was at its worst, during a snake dance, a wild magic storm hit. All the participants were affected. Some immediately, until the next full moon and a rare few didn’t have the trait appear but their children did. The mutation varied depending on the tribe, inclination and nearness to snakes. Because most nobles are dragon-blooded they eventually gained control and became shifters. Others show their serpent traits in appearance and temperament.
Their cousins on the other side of island in Slithoria (change), had a similar occurrence but with lizards during a lizard dance. They had a worst effect, because the predatory nature of the lizards was stronger and all but subsumed their humanity. Many of the lizardfolk became violent and warlike as a result.
So came the war. Lizard vs snake. Their draconic cousins on the nearby island of Dracoria eventually enforced a peace before their mutual destruction. They created a neutral zone around the holy lake of Takshila. The Goddess Devangara created the winged naga in her image to be protectors of the peace around the holy lake.
The seven tribes are as follows (add subtype as needed):

• Marindara: Any N, eel or see snake lower body, humanoid upper. small-medium.
• Nagan: N-NG, fully scaled, snake-headed humanoids. small-large
• Quezl-Nagan: N-NG, fully scaled, rainbow colored winged (feathers) snake. small-large
• Maralith: Any-partial to fully scaled humanoid upper body with snake head, un-scaled lower humanoid body. small-medium
• Yuan-ti: Any-N, fully scaled humanoid upper body with snake head, scaled lower snake body. small-medium
• Lamia: NG-N, humanoid upper body, snake lower. small-medium
• Noble: Any N, can look or shift to any of the above or a combination off traits. Many show dragonblood traits as well. small-medium

See later posts for more on the seven tribes.

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