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Fanged Metal 4-piece is a no brainer, but 2-piece is flex. You could run 2-piece 
Puffer Electro if using a PEN% D5 and 2-piece 
Freedom Blues or 
Chaos Jazz works fine too.
Alice does get AP from AM as a result of 
Core Passive: Twin Rainbows of the Swordheart, so 
Phaethon's Melody is the all-around best bet, but if you don't need the extra build-up, other sets do fine.
AP on D4 is a given, and since Alice gets AP from AM, we're running it on D6 - D5 though is quite flex.
For the rotation for this upload, the 35% DEF Shred from the Artful buff meant PEN% was doing less damage than ATK.
Damage % would normally be great, but we're getting 40% Damage Bonus from Artful, another 40% from Practiced Perfection, then 15% from 
Yuzuha, another 15% from 
Swing Jazz, and another 45% from Fanged Metal.
Depending on Support Drive Disc uptime, that's anywhere between 140% to 155% Damage Bonus, so it's very saturated. So for now, ATK is best, but the slot is flex.
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4 - Anomaly Proficiency | 5 - Attack | 6 - Anomaly Mastery |
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Not much to mention in regards to the set choices as they're as good as you can get for 
Vivian. AP is especially important as 
Basic Attack: Featherbloom Abloom triggers will almost always be Physical. There will be some Corruption Disorder damage, but very few Ablooms triggered of Corruption, so Attack and Damage % aren't as worthwhile, meaning Freedom Blues or Chaos Jazz is best.
As with Drive Discs, AP is the priority. It's fine to sacrifice some Attack subs if it means getting more AP as most of Vivian's damage will be derived from Ablooms. As Alice is the one getting element matched, running AM on D6 is important as otherwise Vivian will struggle to keep up application to maintain Artful's Disorder buff up.
Main Stats | ||
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4 - Anomaly Proficiency | 5 - Ether DMG Bonus | 6 - Anomaly Mastery |
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Swing Jazz is the 4-piece, but 
Proto Punk or 
Astral Voice are fine picks as well. Miasmic Fiend can range from passive to incredibly aggressive, so Proto Punk has a higher potential ceiling whereas Swing Jazz is the most consistent.
Depending on how you optimise your rotations and if you purposefully get hit by enemy attacks to trigger Quick Assists, Astral Voice feeding Alice is arguably the strongest option, but would be difficult to maintain.
Standard line-up of AP, Attack and AM - no other option for Yuzuha. In an Assault comp, where her attacks will be diluting Physical Anomaly build-up, the more AP the better. You will want to hit the 3,000 Attack limit for Core Passive: Whimsical Wonder before focusing on AP though.
Main Stats | ||
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4 - Anomaly Proficiency | 5 - Attack | 6 - Anomaly Mastery |
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This run is freestyle, which means it is not following any specific set rotation.
Just because it's unstructured doesn't mean that it's just pressing buttons, as there are broadly a few things you want to look out for.
Miasmic Fiend will go invulnerable and begin her phase transition at around 01:50 to 01:45 on the clock. Luck is a big factor, as she may begin an attack shortly before the transition is due to happen which will animation lock her out. If that happens, don't interrupt her with 
Ultimates or Corruption until she's done. then keep her locked down after to extend the duration.
As her Anomaly DMG stacks reset when Miasmic Shield comes up and you're given plenty of resources after it breaks, you want to blow all of your Energy and Decibels for as much burst as you can before she goes to maximise use of her buff and empty out your resources to avoid overcapping after.
Keep in mind that Basic Attack: Starshine Waltz has a rather low interrupt level, so Miasmic Fiend can - and will - jump out of it mid attack during the phase transition (and even with regular attacks)! Yuzuha 
Ultimate: Surrender or Suffer the Mischief is particularly good here to stop the boss from moving until the Polarity Assault lands.
During the phase transition mechanic, Yuzuha can use Basic Attack: Tanuki Cloak to parry both the spears and the explosion AoE. After which, you can dodge left and right to farm Decibels with the Perfect Dodge bonus.
Alice is the character that should get Yuzuha's Flavour Match. The goal is to just loop as many Assaults as possible while making use if Vivian 
Assist Follow-Up: Featherblade Execution to build-up to Corruption and keep up Feather generation.
Since Polarity Assault from Basic Attack: Starshine Waltz can trigger Basic Attack: Featherbloom's Abloom like a regular Anomaly, you'll want to routinely be gaining and converting feathers on Vivian for the most damage.
Depending on how things line up, making use of the hold 
Dodge input after Vivian's 
EX Special Attack: Violet Requiem to go into a Basic Attack: Noblewoman - Waltz can help to build even more Feathers and add a bit of extra Anomaly as well.
Whenever Alice uses Basic Attack: Starshine Waltz, you can swap to Vivian for EX Special Attack: Violet Requiem then immediately swap to Yuzuha for 
Basics in order to trigger Assault before the Polarity Assault lands and initiates a Disorder ICD.
Since Alice gets Flavor Match, you won't realistically have enough Ether build-up to Disorder every Assault, but that's fine. As Alice can self-Disorder, so long as you're juggling Disorders every 10 seconds, Artful can stay up.
Ideally you do want to apply Corruption soon after any Assault lands as a result of Alice's Core Passive: Twin Rainbows of the Swordheart. Unlike Damage Over Time Anomalies (Burn, Shock, Corruption) which will still do most of their damage through ticks anyways, the extra Disorder DMG Multiplier buff Alice provides isn't being made up elsewhere, so the faster Assault is Disordered the better.
Just be mindful of Disorder ICD, as it can be difficult to work around it.
