Rei (Tentative Name)Limited

A Wind Code Burst stage 3 (B3) Assault Rifle DPS whose Attack StateB delivers all-enemy Burst Skill damage and her own ATK buff at once.
Annihilation Support1 depends on enemies with stacked Anti-AT Field and allies in Annihilation State.
Her Burst cooldown is 40 seconds, so her Burst 3 rotation is fairly slow.

Attack StateB puts her in Attack StateB, granting an Attack Damage increase and Increased ATK based on the caster's ATK for 10 seconds. It deals Burst Skill damage proportional to final ATK to all enemies.

Annihilation Support1: when 18 normal attacks hit, if the target is under Anti-AT Field, it deals extra damage proportional to final ATK and raises Anti-AT Field stacks by ten. While she is in Attack StateB, every 7 normal attack hits deal extra damage proportional to final ATK to the target. When Full Burst Time starts, it grants all allies in Annihilation State +1 Annihilation State additional effect target, a 500% increase to Annihilation State additional effect attack range, and Increased ATK based on the caster's ATK for 9 seconds.

Maintenance and Resupply2: when Full Burst Time starts, it grants all Machine Gun allies who used a Burst Skill just before it increased Machine Gun Ramp-Up Speed for 13 seconds. When Full Burst Time starts, it grants all allies Increased ATK based on the caster's ATK for 10 seconds.

After entering Full Burst, keep landing normal attacks to meet Annihilation Support1's hit condition.
To give a Machine Gun ally Maintenance and Resupply2, set things up so that ally uses their Burst Skill just before Full Burst starts.
Auto play is enough by default. Only take manual control of aim timing when you want to focus normal attacks on enemies with stacked Anti-AT Field.

Needs manual input

To shorten Assault Rifle reload windows, prioritize the Resilience Cube. Support ammo refill with the Bastion Cube. If you need more Burst Gauge, the Quantum Cube is the runner-up. If Harmony Cube levels differ a lot, use the higher-level cube ahead of the ranking.

Set Elemental Advantage damage and ATK as the baseline. To keep normal-attack stacks rolling, use ammo to tune shots between reloads.

Attack StateB packs her own ATK buff and all-enemy Burst damage together, so raise the Burst first. Annihilation Support1 holds the late Anti-AT Field payoff and Attack StateB-linked extra damage, so raise S1 next. Maintenance and Resupply2 is the Full Burst-start team ATK buff and Machine Gun ramp-up, so fill it with leftover materials.

She deals solid damage in boss fights against Electric Code enemies (= Wind advantage) when the element matches. There are dedicated lineups that run Anti-AT Field and Annihilation State together, so set up those conditions first. In Arena, Assault Rifle front-line damage and a single Burst shot become important.

Attack StateB grants her Attack Damage and Increased ATK and deals Burst Skill damage to all enemies.
At the start of Full Burst she grants Increased ATK to all allies.
If there are allies in Annihilation State, Annihilation Support1 grants them +1 additional effect target, increased attack range, and an ATK buff at the start of Full Burst.

Without Annihilation Support1's Anti-AT Field link, her normal-attack extra damage drops sharply.
Maintenance and Resupply2's Machine Gun ramp-up only applies after a Machine Gun ally uses their Burst Skill right before Full Burst.
Her Burst cooldown is 40 seconds, so her Burst 3 rotation is fairly slow.

A limited collab recruit Nikke.