Modernia

A Fire Burst 3 Machine Gun DPS who quickly clears multi-enemy waves with her Full Burst extension and Annihilation Mode full-screen aim.
She is still strong in story and Tower, but in boss fights she is usually kept off-Burst for her off-Burst firepower, and she is not a top Solo Raid score carrier.
Against Fire-weak bosses and in Solo Raid, she is often a main DPS candidate.

Each Machine Gun normal attack hit adds extra damage, and cumulative hits raise Critical Damage while lowering Max Ammo. When Full Burst starts, all allies' Hit Rate rises, and as hits build in that state, her own ATK rises once more. Using her Burst Skill extends Full Burst time by 5 seconds and grants herself unlimited ammo and Annihilation Mode for 15 seconds, aiming at all enemies within the aim range at once for cumulative damage.

In story and multi-enemy waves, use her Burst Skill right after Full Burst to turn on Annihilation Mode and keep firing.
In boss fights, she is usually kept off-Burst without using her Burst Skill, just continuing Machine Gun fire during Full Burst.
Leave her on auto by default. Against bosses with a core, aim manually to build hit count and Critical Damage stacks.

Ammo refills and reload reduce gaps in her Machine Gun fire. Support Hit Rate during Full Burst with the Assault Cube. If Harmony Cube levels differ a lot, use the higher-level cube before the ranking.

Prioritize Max Ammo so her fire does not break. Use leftover lines on Crit Rate or Hit Rate to support High-Speed Evolution1 stacks and core hits.

In boss fights she rarely uses her Burst, so raise High-Speed Evolution1 and Giant Leap2 first. Only fill the Burst if you use Annihilation Mode often in story or multi-enemy sections.

In story and Tower multi-enemy waves, Annihilation Mode clears fast. Against Fire-weak bosses and Solo Raid, she is used as an off-Burst main DPS. Her priority in Arena is low.

Annihilation Mode hits enemies within the aim range at once, great for clearing waves and intercepting projectiles.
Unlimited ammo during Burst keeps her Machine Gun fire uninterrupted.
She raises all allies' Hit Rate at the start of Full Burst.
Her off-Burst rapid-fire firepower in boss fights is still high in Fire-weakness content.

Her 5-second Full Burst extension can slow squad damage in fast-rotation boss lineups.
Her own ATK buff is small, so her firepower falls short in high-end single-target boss fights.
In the boss meta, off-Burst alternatives like Mihara: Bonding Chain are used more often.
As a Machine Gun, she depends on core hits and investment in ammo and reload.

Each normal attack shot counts as two hits, so she fills Burst Gauge better than other Machine Gun units.