A while ago, while reading a book (books... ugh), I started thinking about the concept of fear (book about just after WWI, so yeh. had 2 read 4 school).
While thinking about fear, an odd looking character appeared in my mind, which I instantly found scary.
Because of this, I eventually made three characters to represent my concept of 'fear'.
The first is Phoia:
Phoia sketch

Phoia represents 'the one that fears'.
Her name derives from Φόβος, the personification of fear in Greek mythology.
She has high intelligence, but fears just about anything she knows little about.
I also just finished drawing a coloured version of her, in which I also tested shading:
Full body

Scared face

The little thing below her eye is actually the normal face eye popping out a bit, but it looked funny, so I added it in this picture.Next are two spirits, one of which is an angel, the other a devil.
They're basically my take on the whole consciousness thing, where you ofter see an angel and a devil appear on the shoulders.
This is also the reason why Phoia has a white and a black sleeve.
They can both take over Phoia's body, if needed or wanted.
First is Deima, who represents 'the disguise of fear'.
Her name derives from Δεῖμος, the personification of terror in Greek mythology.
When controlling Phoia, she makes Phoia look overly normal and gives Phoia a giant raise in social abilities, which Phoia lacks.
'Disguise of fear'
When thinking of fear, often you will see that the scariest things seem normal at first. This is what Deima representsDeima sketch

Deima taking over Phoia
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And last but not least is Eri, who represents 'fear itself'.
Eri's name derives from Ἔρις, the goddess of Chaos, Strife and Discord in Greek mythology.
Eri's design is based on a succubus, which is basically the first thing that came to mind.
When taking over Phoia, Phoia will basically turn into a psychopath.
For this reason, Phoia will constantly try and keep Eri from taking over, but if Phoia lands in a too deep state of fear, Deima will be cancelled out, causing her to be unable to stop Eri.
The character that popped into my mind at the beginning of this post was actually Phoia, while being controlled by Eri.
Eri sketch

Eri taking over Phoia

Edit: sorry for the long post, but the pictures just wouldn't be complete without descriptions >.<