Mia

My Mia is built on Speed. She will be doubling units a lot, and focuses on lowering enemy speeds for her benefit, and her teammates' benefit. Due to outspeeding almost every unit in the game, she will charge her special very often, and Astra will be ready to go in 2 hits. If she's under 75% HP on Enemy Phase, she can activate Astra and finish the enemy off without taking more damage.

Used for Arena Defense, Distant Counter and Wrath make sure she can retaliate damage from every distance, Spd Wave boost her speed to 49 on Odd turns, making sure she doubles everytime it activates and uses Flashing Blade to activate Luna in every battle on EP, debuffs allowing.

Merge: +4
Seal: Heavy Blade 3
Blessing: Earth

Resolute Blade (Weapon)
Effectively a 19MT Wo Dao. Mia has pretty above average Attack, but appreciates any Attack boost she can get. Her sheer power and blazing speed makes her a deadly user of this weapon, especially if she's armed with Moonbow or Glimmer.

Reposition (Assist)
Very self-explanatory.

Moonbow / Glimmer (Special)
Mia can effectively run one of the two Specials depending on the situation. Moonbow is her go-to Special because it allows her to reduce the bulk of her enemies while Glimmer outright destroys physically fragile units, including some Blue units.

Death Blow 3 / Fury 3 (A-Slot)
Primarily used to trigger Heavy Blade easier. But it also gives Mia a much needed boost in Attack.She is, however, not weak by any means. She can alternatively run Fury to boost her offenses and defenses, whilst taking chip damage from it to help her get into Desperation effect.

Desperation 3 (B-Slot)
With Mia's incredible Speed, she is a very solid user of Desperation. It also synergizes well with Fury.

Drive Atk 3 (C-Slot)
Normally Mia is not much for support, but if need be, she can be. Though, she would prefer skills that benefit herself most of the time.

Heavy Blade 3 / Flashing Blade 3 / Brazen Atk/Res 3 (Sacred Seal)
Both Heavy Blade and Flashing Blade work well with Mia and helps her activate Moonbow/Glimmer every round of combat. However, in the scenario where both seals are taken, then she may resort to use Brazen Atk/Res instead.

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Pros:
+ Excellent offensive stats of 32 Attack and 40 Speed
+ Comes with a powerful weapon, Resolute Blade, that is basically a 19MT Wo Dao
+ Natively comes with Flashing Blade skill, which can help her activate Specials easier, but prefers it in a form of a Sacred Seal
+ Mostly very flexible to build

Cons:
- Mia's base kit lacks synergy in general and requires a bit of investment in order to become a very competent unit
- Has competition with Ayra and Karla, the two who have skills that involve with Speed, however she loses in majority of the matchups and is better compared with Soleil instead
- Naturally weak to Swordbreaker and vulnerable to majority of tanky Blue units

[Preferred IVs: +Atk/+Spd, -HP/-Res]

With the Flashing Blade Seal, Mia can now take advantage of her Speed to increase cooldown while still leaving her A Slot free for a powerful skill. This build aims to capitalize on this new advantage and evolve Mia into an even more powerful Player Phase beast than before.

Weapon: Resolute Blade, Mia’s default unique sword, remains a fantastic weapon of choice. Alternatively, if you want to further boost Mia’s Speed rather than her Attack, you could use a Slaying Edge+ (+Spd) or a Wo Dao+ (+Spd).

Assist: Reposition is a great movement assist skill. Ardent Sacrifice is also a great choice to put her in Desperation range as long as she doesn’t have a +HP boon.

Special: Moonbow or Glimmer are great short-cooldown specials to benefit the most from her sword’s Wo Dao effect. Luna, Sol, and even Galeforce or Aether are good choices as well, depending on how she is planned to be played.

A Skill: Fury 3 now can greatly boost Mia’s overall performance while also contributing to putting her into Desperation/Vantage range thanks to the Flashing Blade seal. This will boost both her Attack and Speed, while also raising her bulk. Life and Death is also a great option.

B Skill: Desperation 3 is a perfect choice for Mia, letting her strike once and then with the buffed-up Moonbow (from her sword’s effect) before the foe can strike back. Vantage 3 is an acceptable alternative if you wish to improve her Enemy Phase presence.

C Skill: Atk Smoke 3 allows Mia to possibly tank a hit in the Enemy Phase more easily. Def Smoke 3 can be used if you’re using Vantage as well in order to let her defend with a harder hit before being attacked. However, what goes in this slot mostly depends on player preference and team composition.

Sacred Seal: Flashing Blade 3 as her seal lets Mia free up her A Skill slot for more powerful skills without losing this cooldown-shortening ability.

With an atk boon Mia reaches a pretty high atk of 54. Since she lacks the bulk to survive multiple exchanges I decided to focus on her offensive power. Running deathblow puts her to 60 atk on initiation, now combine that with Odd atk Wave gets her to 66 atk on odd turns. You could alternatively put Swift Sparrow on her A skill to boost her speed as well since with this IV set she doesnt have a spd boon. While I put glimmer as the special, putting galeforce on her along with keeping her native Luna is acceptable.