Couati
The Couati are a race of feathered serpentine humanoids, not unlike the Yuan-ti purebloods. They range in appearance from nearly indistinguishable from a human to nearly Couatl like in appearance.
They are born from a union of Couatl and humanoid races, appearing as a mixture of the two. Their divine feathers begin small, appearing only in select easily hidden locations, but as one grows they become larger until the feathers may cover the Couati's entire form.
Their natural enemies are the Yuan-ti, as they are nearly diametrically opposed to them in purpose and form. They form groups of Couati and other good natured creatures in order to empower good, and seek to rid the world of evil.
Heavenly Purpose
Couati are divine in nature, and they share some of the memories of their Couatl parent. They naturally align with their parents and very rarely stray to their own path. If a Couati were to become evil, they would slowly loose their feathers and transform into a yuan-ti pureblood, forever scorned by their kin.
A DM is free to rule this differently.
Couati Traits
The Couati have the following traits.
Ability Score Increase Your Dexterity increases by 1, and your Wisdom increases by 2.
Age Couati reach maturity at a young age of 7, and can live up to 700 years.
Alignment Almost all Couati are good aligned, but some are neutral.
Size Couati are the size of their humanoid parent, and vary little from this.
Speed Your movement speed is 30 feet.
Languages You can speak, read, and write Common and Celestial.
Celestial Your creature type is Celestial. Additionally, you are resistant to radiant damage.
Darkvision You gain darkvision out to a range of 60 feet.
Bite Your serpentine mouth is a natural weapon, which you can use to make unarmed strikes. If you hit with it, you deal piercing damage equal to 1d6 + your Dexterity modifier, instead of the bludgeoning damage normal for an unarmed strike.
Divine Boons
You possess boons that were given to you from your celestial parent. You gain one of the following features of your choice:
Celestial Sense
You can cast the spell detect evil and good once per long rest.
Divine Mind
You are immune to scrying and to any effect that would sense your emotions, read your thoughts, or detect your location.
Peaceful Purpose
When you drop a creature to 0 hit points and not killed outright from a spell or attack, you can cause the creature to become stabilized.
Sedating Bite
When you damage a creature with your Couati bite attack, if the creature has fewer hit points than twice your level after this attack it must make a Constitution saving throw with a DC of 8 + your Proficiency bonus + your Wisdom modifier or fall unconscious for 1 minute. If the creature is reduced to 0 hit points by this attack, it becomes stable.
3rd level
At 3rd level, your divine traits shine through a little further, giving you a new boon of your celestial origin. Choose one of the options you didn't take at 1st level, or one of the following options:
Celestial Blood
You have advantage on saving throws against poison, and you have resistance against poison damage. In addition you are immune to disease.
Powerful Sight
You have advantage on Intelligence (Investigation) checks to disbelieve illusions. You can also see into the ethereal plane up to a range of 10 feet.
Restoring Touch
You can cast the spell lesser restoration once per long rest.
5th level
At 5th level, your divine traits shine through fully, giving you a final powerful boon of your choice. Choose one of the options you didn't take at 1st or 3rd level, or one of the following options:
Divine Tongue
You can cast the tongues spell at will, targeting only yourself.
Healing Touch
You touch a creature as an action, magically restoring up to a number of hit points equal to half your level. In addition, the touch removes all diseases and neutralizes all poisons afflicting the target. Once you use this feature, you cannot use it again until you complete a long rest.
Radiant Wings
As a bonus action, you sprout divine wings and gain a flying speed of 30 feet for 1 minute. Once you use this feature, you cannot use it again until you complete a short or long rest.