A/N: Decided to do this based on PJO and what I think each of their flaws would be.
Xylo: Loyalty
Mario: Hubris
Kaykrae: Grudges
Brandeen: Wrath
Daveed: Loyalty
Austin: Accepting love that you don't deserve
Jakey: Hubris
Mitch: Loyalty
Amaya: Self sabotage
Ashara: Loyalty
Atlas: Avoidance
Austin (S.2): Hubris
Bri: Accepting love that you don't deserve
Brick: Wrath
Brinley: Indecisive
Bryan: Self loathing
Cal: Loyalty
Cassi: Inability to trust
Ciaran: Hubris
Coleus: Naivety
Colin: Cowardice
Colin (S.2): Trusting to easy
Daisy: Loyalty
Davis: Hubris
Dina: Loyalty
Dolus: Hubris
Dranne: Inability to trust
Drannus: Hubris
Dan: Avoidance
Emiya: By the book
Etzili: Self loathing
Farrel: Naive
Femi: Loyalty
Inmo: Loyalty
Inpu: Hubris
Iroh: Loyalty
Ivy: Naive
Jamey: Hubris
Joey: Self sabotage
Kai: Hubris
Kaiba: Hubris
Kaya: By the book
Korina: Loyalty
Lee: Partying
Lotus: By the book
Lychee: Loyalty
Magnus: Hubris
Mania: Accepting love you don't deserve
Marshie: Loyalty
Mevodus: Wrath
Micheal: Grudges
Mikeal: Grudges
Minamoto: Naivety
Momiji: Hubris
Mors: Wrath
Nad: Self Loathing
Naya: Self sabotage
Nefeli: Loyalty
Nero: Accepting love you don't deserve
Ning: Naivety
Reverie: Hubris
Ricarro: Naivety
Ritchie: Self sabotage
River: Self loathing
Roja: By the book
Ryggy: Hubris
Seek: Loyalty
Seek (S.2): Naivety
Solis: Loyalty
Soren: Wrath
Teras: Naivety
Vargur: Grudges
Xiphos: Naivety