Please note that I actually consider these concept photos of most of the important cast members. The website I used was sort of limited as far as what I could do with their appearances. Nonetheless, hopefully you'll now have some kinda picture in your head of these characters!
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Nathan Blackwood

~Even though it's slightly cut off, his hair isn't supposed to merge in the center, it's supposed to be just regular spikes. Other than that, he looks as how I imagined.

Joseph Luno

~Perfect on face and complexion, but as I've described, Joseph is actually a lot more muscular. Think, John Cena's build.

Adrianna Schultz-Blackwood

~Nothing wrong here.

Fiona Blackwood

Geo

~Whenever I said his suits were a color, his ENTIRE suit was that color, so only that white shirt is wrong, but whatever! It's as spiffy as he gets, hahaha!

Vincent Blackwood

~Vincent in the bonus chapter.

Natalia Blackwood

~I bet you're scrolling back and forth to compare her with Nathan, Fiona, and Vincent right now. 😂

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Of course, we have our other characters, as they are all depicted differently, especially with mine. So instead, I'll just put their real/closely depicted photos here. Let it roll (Credit of photos goes to original owners!):
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The Grim Reaper

Satan

Yama

Iblis

Zeus

Jesus Christ

Jehovah

Poseidon

Hades

Anubis

Horus

Demogorgon

Behemoth

*Scroll to continue!