2BLimited

She is a Burst 3 Defender, but Max HP stacks and converting final Max HP into ATK make her a frequent main DPS pick in long single-boss fights.
Her Burst and basic attacks lean heavily on crits, so a supporter that buffs Crit Rate and Critical Damage in the same squad helps.
Short fights often end before her Max HP stacks fill, so her strengths show less in fast story stages with tight timers.

From the start of battle, part of her final Max HP converts into ATK, and each time she uses her Burst Skill during Full Burst her Max HP increase stacks one step. Every time 300 shots are filled, one extra hit lands on all enemies. Her Burst Skill deals distributed damage to all enemies and extra damage to the single enemy with the highest remaining HP. The Max HP buff counted when calculating Burst damage is the value stacked up to just before, so for the first few casts while stacks rise, the timing lags one beat behind.

In long boss fights, even on auto, the 300-shot condition and Max HP stacks fill within the fight.
With a supporter like Novel whose damage-taken debuff lands at Burst timing, use her Burst Skill after the debuff is applied.
In short modes like Arena, the match is often decided before her stacks and supporter buffs settle in.

The Bastion Cube aims for ammo refills while firing, and adding Reload Speed with the Resilience Cube makes AR firing and the 300-shot condition much smoother. In Cooldown reduction lineups, consider the Quantum Cube for Burst Gauge support. If Harmony Cube levels differ a lot, use the higher-level cube before the ranking.

Keep Fire Elemental Advantage damage and ATK lines as end-game goals, and prioritize Critical Damage and Crit Rate lines to reduce Burst crit variance. Pure ATK substats feel small given her skill structure, so spread them over leftover lines.

Cluster Bomb2 is the core of her final Max HP to ATK conversion, so raise it first, then follow with her Burst since its Burst Skill multiplier is large. Survival1 is for stacks, so keep it low early and finish it later.

She is often discussed as a main DPS pick in long boss fights such as Union Raid, Solo Raid, and Special Interception. Late-story multi-wave stages and short timers often end before her Max HP stacks fill. In Arena she comes up alongside Burst nukers and defensive lineups. In stages with heavy mob waves like Tower, her low basic-attack multiplier can make overall clears feel slower.

Max HP stacks plus converting a share of final Max HP into ATK push her ATK very high.
The distributed damage and the extra single-target hit on her Burst Skill give her strong burst firepower.
Her Defender base and Max HP buff also cover survival.

Her normal attack skill multipliers are low, so her basic-attack share is weaker than other Assault Rifle units.
Fully stacking her Max HP takes several Full Bursts, so expected damage drops in short fights.
Her Burst damage swings a lot depending on whether it crits.
It is distributed damage, so it is hard to focus on a single target by aiming.