This is just a list of all the important characters. I got my characters from an AI character generator website, so none of those images are original and I haven't done the canon characters because I'm assuming you already know how they look. Lastly, some bits aren't exactly accurate, but that's too bad.

Made-up characters:

1. 

Name: Summer

Species: Demigod

Gender: Female

Age: 12

Traits: Thoughtful, secretive, sarcastic, clever, likes reading, will happily destroy you, omniverted

Fatal flaw: Curiosity

Picture:

2:

Name: Marina

Species: Demigod

Gender: Female

Age: 12

Traits: Fierce, loyal, impulsive, slightly on the sassy side, chatty, extroverted

Fatal flaw: Pride

Picture:

3:

Name: Lou

Species: Demigod

Gender: Male

Age: 12

Traits: Funny, clever, good at deception, loyal, adventurous, can get secretive, ambiverted

Fatal flaw: Holds grudges

Picture:

4:

Name: Dianeira

Species: Tree nymph

Gender: Female

Age: 13

Traits: Quiet, daydreams a lot, thoughtful, ready to fight, underestimated, introverted

Fatal flaw: Feeling useless

Picture:  *IN HUMAN FORM*

5:

Name: Sebastian 

Species: Satyr

Gender: Male

Age: 28 (but easily passes as 13)

Traits: Sporty, funny, likes pranking people, hyperactive, laughs creepily when nervous, extroverted

Fatal flaw: Arrogance

Picture: *IN HUMAN CLOTHES*

6:

Name: Malerion

Species: Demon

Gender: Male

Age: Immortal (ish)

Traits: Evil, psychotic, evil, manipultaive, evil, power-hungry.... did I mention evil?

Fatal flaw: Arrogance

Picture:

7:

Name: Cadmus

Species: Semi-demon

Gender: Male

Age: Very very very very old (but passes as 12)

Traits: Quiet, shy, secretive, lives by his morales, kind, likes drawing and reading, introverted

Fatal flaw: Being gullible

Picture:

And those are more or less all the main characters!