She's playful, fairly relaxed, easy-going, whimsical and pampering.
Touch Fluffy Tail
My tails are fluffier than anyone.
She also means no harm to humans and actually wishes for coexistence between humans and monsters.
She is also an expert strategist and has the uncanny ability to recite information by just licking the person or object. She is well-versed in advanced technology.
Her main elemental attribute is Earth yet she also uses fire in her Six Ancestor form.

An extremely young Archangel, Mariel was known as a child prodigy. 
Despite her innocent look, she’s extremely aggressive and merciless. With quick, dextrous movements of her young limbs she takes great pride in breaking her enemies through thoroughly attacking their weak points.

Receiving divine punishment from one as young as Mariel  usually brings great shame and immoral feelings to the vanquished. Even minor sinners didn't got spared, which itself almost got her labeled a criminal.

Despite young & innocent, she’s very merciless.

I am the leader of the Mt. Ooe oni clan.
Let's! Go! Play! I'm here for festivals, so I'm going to indulge all I can!
Oni are supposed to eat men, destroy them, and take all they have.
I like receiving offerings
What should I eat next? Or maybe I should play?
You do know there's nothing worse than an oni that's bored, right?