Larva is a character from Vampire Princess Miyu.   He is a shinma (demon) that helps Miyu with her duties as Guardian.   I was never really interested in his character until he took off his mask.
 Here are some pictures of him.
A pose
Another pose
With his head bowed
Close up
Side view

Quotes
Unfortuantely, he doesn't talk much.  He's just the strong silent type.

"If I use this power, it is because I failed"
- His explanation of why he has cleansing fire.
 

Screen Time
He fights in almost every episode and is always looking out for Miyu especially when she lets her guard down.