Unit Analysis by Team BethelFrankel
Class
Detonator with attack buffs and hefty shields.
Overall
S+
(SS at BT3)
Advantages
+High damage and shield generation give her some of the best role compression in the game
+Strong damage due to powerful Atk% and Damage% buffs combined with diagonals
+Powerful shielding that pairs well with Lilica to also output staggering levels of true damage
+Shield support and HP drain combos incredibly well with Hati
Disadvantages
-– Dependent on other shield supports to reach her damage ceiling
– Much of her personal ceiling is locked behind refinements
– BT3 is a significant upgrade outside of Lilica teams
Explanation
Mia is the second anniversary’s limited unit, and she lives up to the hype. In terms of damage, her closest comparison is Areia: both possess potent ATK% buffs with additional upside (Piercing and Diagonals + Damage%, respectively) on 2CD actives. However, unlike Areia, her kit doesn't really have any drawbacks or stipulations. In fact, it has additional defensive utility in the form of bulky shields, and better flexibility. She's easily SS-tier at BT3; however, she's also an absolutely meta unit at just BT0.
It’s weird to say that such an individually powerful unit’s potential is somewhat reliant on her teammates, but it’s also true. Mia and Lilica mutually benefit from each other’s shield generation, the former gaining increased damage boosts and the latter turning their defensive utility into AoE true damage. Meanwhile, her relationship with Hati is much more one-sided: Hati benefits from not only her shield but also her HP drain.
In short, she's an incredibly good standalone unit, but she's one of the best units period with the right teammates.