Here are what the characters look like in Soul Savior:

Note: Azim's eyes are more blue than seen here.
Roy's hair is dark brown and audburn tinted.
Envy's hair is medium length.

The people seen here are how I picture my characters even though there are a few exceptions noted above.
I looked for pictures of people based on how their face looked and compared it to how I imagined the characters in my story.