Delta is one of Kara's "Inners"—a powerful cyborg with serious firepower and an even more serious attitude problem. She's completely devoted to Jigen, her loyalty apparently unshakeable, but she basically doesn't get along with anyone else in the organization. The other Inners clearly aren't on her list.
What really stands out about Delta is her confidence, which honestly borders on delusional. She genuinely believes she could take down Naruto Uzumaki in a fight, despite the fact that he's way out of her league. That arrogance extends to Code too—she's constantly pestering him to fight her one-on-one, but he keeps shutting her down. His reasons for refusing? Nobody really knows, and it's one of those mysteries the fanbase loves to speculate about.
Content compiled by AnimeList.moe from publicly available sources.
