Delphinus Mii is a B-rank support focused on emergency protection through HP state recording and conditional recovery. In practical terms, she is mostly a collection unit with very limited long-term value.
Her core contribution comes from Angel Vortex, which records an ally’s HP, purifies them before their next action, and restores them to that recorded value if they fall below it. Against the Tide adds a chance-based fatal recovery for that protected ally, which can occasionally save a carry but remains inconsistent even at higher levels. Her basic attack includes random buff dispel utility, but the impact is minor and too unreliable to define a support slot in serious fights.
Overall, Delphinus Mii can function as a temporary beginner safeguard in very early progression where survival tools are scarce, but her low consistency and B-rank scaling keep her out of meaningful competitive use.
