Homebrew Half-Oni Species Details

"While I was traveling on a pilgrimage to some ruins, I thought I was dead as a beast in the mountains tackled me to the ground pinning me. Then a large demonic figure appeared and threw the werewolf off me, with two monsters fighting to the death a werewolf and what seems to be something resembling an 8ft tall tiefling without a tail pins the beast down and ripping it's jaw in half with it's bare hands... I thought I was going to be next as I was prepared to say my prayers before being devoured by this demon, a smiling warm face looks at me with piercing eyes offering me a hand and helps me up. We sat together and had a drink of some warm alcohol in these snowy mountains chatting, such an imposing demeanor yet a warm aura. I never knew there were half-Oni in the world and that something with such monstrous blood could show such kindness to a wandering traveler."
 ~Victor Valendalf, Explorer and priest

Mysterious Birth
Scholars are still trying to unravel the mystery of half Oni births. Many believe it to be the result of a bloodline curse that occasionally effects a child to have an unusual birth that kills the mother yet this theory is still yet to be proven.

A appearance of the half-Oni
The half-Oni has two forms their true form and their human form, Their true form they stand around 7-8 feet tall with pointed ears, fangs, long black nails, horns, and slit pupils, along with their colorful skin tones ranging from blue, red, and on very rare cases violet and grey. 

When they take on a more socially acceptable form they shrink 2 feet shorter and their skin color changes to that of a humans ranging from pale to dark skin tones but keeping all of the other Oni features.

A half-Oni diet
Half-Oni's have a taste for Alcohol and love meats, they can eat vegetation but they will never enjoy it.

The life of a Half-Oni
Half-Oni's usually make their home in the more calm parts of cities or in villages, while some prefer the life of a nomad traveling with the world their home. They live in the moment most often without worry for the past or the future but some with ambitions may have their own goals of making a name for themselves or building a city of their own to rule over. Half-Oni are very protective of those around them stemming from how Oni's protect their property and they are very protective of their territory such as their home or their families.

Half-Oni Traits

The Oni blood running through your veins grants you

Ability Score

Your Oni blood grants you some of the natural potential of an Oni, add 1 to con and 2 to either strength, charisma, or intelligence

Age

Half-Oni mature around 15 years old and the oldest known Half-Oni lived to be roughly 300 years old

Alignment

Half-Oni's inherit the Oni's chaotic nature

Size

Half-Oni's are usually 7-8 feet tall and have fit lean or muscular builds they are a medium size

Speed

Half-Oni have a movement speed of 30ft

Dark Vision

Thanks to your Oni Blood, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern color in darkness, only shades of gray.

Powerful Build

Your Oni blood grants you increased vigor allowing you to surpass the limits of others, count as one size larger for carry weight, push, pull, and lift.

Drinking Habit

Your natural affinity for alcohol, makes you immune to alcohol poisoning and gives you advantage when rolling to see if the alcohol gets you drunk.

Walker of two worlds

you have two forms. 

Your Oni form and your Human form. As an Oni your skin is either blue, red, or some other color with fangs, pointed ears, slit pupils, sharp black nails, and horns while you stand roughly 7-8 feet tall.

Your human form has a human skin tone and stands at 5-6 feet tall while still having your fangs, pointed ears, slit pupils, sharp black nails, and horns.

(uses one bonus action to change form and you revert to your Oni form on death if in your human form)

Language

You speak, write, and read common and giant