[Unit Detail] Which units are DBB-eligible?

Currently, these pairs of units are DBB-eligible:

- Xenon x Estia 

- Azurai x Korzan

- Tsovinar x Saerenthis

- QiuTong x Sero-Anya

- Tevarius x N'an-Wang-Mu

- Giselle x Kranus

- Juno-Seto x Ensa-Taya

- *Durumn x Vrana

- Nia x Elaina

- Semira x Beatrix

- *Inoko x Vanila

- Katerin x Keres

Newly Eligible Units~

- *Utheria x Gilgamesh

- Mordred x Arthur

- Ultor x Aurelia

- Touka x Kaneki

- Honoka x Tate

- Charlie x Lico

- *Sennie x Chryssa

- *Tarok x Wannahon

- Czorag x Zeis

** Units who have an asterisk (*) beside their name have their DBB details found together as part of a unit detail article.