I think I remember Cordia's conversation with Giocabbe (when Giocabbe asks her to spare Straffan for the sake of their alliance), and they reminince about the old times. Cordia, a young girl was a dark horse and took everyone by surprise, including the "traditionalist old geezers of that time"
Now Cordia is older and and there is a younger generation. Yet, the characters mentioned or introduced, pretty much almost all of them are in his circle or trust.
So it would be good to add more to the character in the MC-Luna-Gracie age group. Whether they become friend or foe, it can depend on the story.
Because as of right now, DeLuca feels like it has a lot of compelling characters in Cordia's generation and also Antonio's age group as well, but I think it could possibly benefit from more younger generation characters i.e. uprising sprouts.
I'm sure Hopes would know best when to introduce such characters, but it could possibly be fun to have the MC meet them when he participates in the Frenetico Tournament, which is basically Olympic Games in the DeLuca universe (mostly it's the Family soldiers who are the participants, but the narrative is that sometimes heirs participate in them to boost the morale of the Family or something)