I don’t really post on someone’s profile. But since I helped you based the Chrysos Hiers have similarities with the Flame Chasers. I’ll give out some examples.
Griseo and Hyacine have one thing they wish to see. A clear sky where everyone can enjoy. Griseo had always wanted to see the stars when the war against the Honkai is over, while Hyacine wishes to heal the wounds of Aquila and take over to become the new Demigod of Sky to protect Amphoreus. They also have similar backstories having relatives in the past with Griseo’s father being the previous Signet of Sky, and Hyacine has a great great grandparent who was the first real Demigod of Sky to challenge Aquila before being fused with the Sky Titan and would later be corrupted by the Black Tide.
Castorice and Sakura Yae share ideals relating to "death" though they have their differences. Sakura’s relation to death is taking someone away from you for the sake of the selfish to live on. It’s the reason why the death of her little sister Rin birth the Herrscher of Death within her darkest hour of the Previous Era. Castorice’s view of death was to shape her will to live as a normal person. She wished to see the human world since she’s the half of Thanatos (Titan of Death) which make sense why Polyxia (who is Pollux the dead dragon in 3.2) brought her to the human world. And as for the concept of death she also has life. That’s why the deer showed up in the animation with Castorice hugging the old woman in the cemetery of Aidonia. Also, for Higokumaru she is the reincarnation of Sakura’s little sister Rin after Kiana broke the endless cycle that has been looping for five centuries.