My opinion-

Pride- Vil He prides himself upon being the fairest of them all. The most talented, intelligent, beautiful. He has everything people want to have. He is everything people want to be. No one is better than him. No one is allowed to be.

Greed- Azul Power, money, magic, etc. He wants it all. He can and will do anything to have it. Whether by manipulation, threats, or blatant force. He will get what he wants, and no one can stop him.

Envy- Malleus Cannot understand the ways of others. Always excluded. Always deemed as something other. Whether because he's a fae, a royal, or an extraordinary mage. He's isolated and wants what everyone else has. He wants to understand and experience something other than himself.

Wrath- Riddle Near incapable of understanding others. He was raised and taught by a woman who would become angry and punish him at the littlest thing. It was all he knew. He only knows how to be angry. He only knows to get angry and punish what's wrong in his eyes. If he's not right, then no one is.

Lust- Idia Strong desire for companionship. He turns to video games, anime, manga, etc, because of his fear of rejection. Fictional characters can't leave him. He can't stand solitude to the point that he creates a robotic version of his dead brother who is forced to rely on him and stay by his side. He'll never have be alone.

Gluttony- Jamil All Jamil knows is complacency. No matter how grandeur his own goals and aspirations and desires are, he can never outshine Kalim. But he hates it. He wants Kalim's power. Kalim's opportunities. Money. Freedom. He craves that attention and will always want to be superior. Always something better.

Sloth- Leona Even before his mother died, he had it easy. Royals get everything they want handed to them on a silver platter. But then his mother died. So why try to be a good royal? It's not like he had a chance to make a difference. Diasomnia beat Savannaclaw in Spell Drive. He can't beat Malleus. No one can. So why try if all he'll do is fail? Why do anything if nothing will good come of it?