Headcanons for Lust! Cross (drawing not mine. It's by obscuredsavepoint on DeviantArt (will remove if want):
-He's a perfectionist
-Not a smooth flirter
-He deals with his emotions by escalation of his perfectionism
-When anyone offers him a favor, he rejects it harshly
-Has mentally abusive parents who fatshame him
-Has volatile loyalty. His loyalty is absolute, but if he perceives a threat to someone he cares about, his control snaps.
-His personal space is a war zone of hyper-organization.
-He tries to schedule his emotional life logically.
-He's his own harshest critic.
-He will never make the first move, but he will dedicate himself perfectly anticipating the object of his affections needs.
-He absolutely hates conflict, not because he's weak, but because it's unpredictable and messy.