Arcana: Fortune Mate

A Fire Burst 2 Attacker Shotgun Nikke.
She gives Shotgun allies ATK and attack damage buffs and also deals personal damage within the same Shotgun squad.
Her buffs are limited to Shotguns and depend heavily on attack speed, so she is mainly used in Raid Shotgun teams rather than as a fixed pick for general teams.

Each time Full Burst ends, she grants Shotgun allies Increased ATK proportional to the caster's ATK. Depending on Happy Moments stacks, she gains effects such as a normal attack damage multiplier.

Memories and Moments2 turns into ammo refill, ammo count, ATK stacks, and so on with each normal attack in the Making Memories state created by her Burst, and grants Shotgun allies increased attack damage when using Burst. Base Shotgun fire rate alone makes it hard to fill all stacks within one Full Burst; it lines up reliably when paired with the Shotgun attack speed buff from Tove's Favorite Item.

Radiant YouthB applies Making Memories, gives herself lasting effects such as Increased Critical Rate and increased attack damage, and deals Burst Skill damage. Longer or shorter Full Burst duration affects Making Memories duration and stacking speed.

The core flow is activating Burst, then stacking with normal attacks during Full Burst.
In Shotgun squads she is usually used with Tove.

As a Burst 2 Shotgun buffer, she goes in squads with Tove, a Burst 3 Shotgun, and a Burst stage 1 cooldown-reduction Nikke. Water-weak Dorothy pierce squads usually run Grave at Burst 2, so they do not share this slot. In Iron-weak squads, the Burst 2 slot is often swapped with Nayuta.

During Burst, her skills alone keep the ammo cycle going, so she relies little on ammo cubes. Use Destruction Cube against bosses with parts; otherwise use the highest-level attack Harmony Cube you own.

Prioritize Elemental Advantage damage and ATK, and rarely use Max Ammo lines. Put Critical Rate and Critical Damage in the remaining lines.

Ally attack damage is on S2, so raise S2 first. S1 is less urgent the more ATK buffs the team has. Raise Burst later to boost personal damage.

Used in Union Raid and Solo Raid Shotgun teams. In Water-weak Dorothy pierce teams, Grave is more often used at Burst 2. She competes hard for the same slot with the original Arcana and Isabel in Electric-weak teams, so running them together is difficult. In Arena, fights often end before she builds stacks.

Aims for both an attack damage buff and personal damage in Shotgun squads.
Her 20-second Burst and screen-wide Burst help with mob phases.

Her buffs apply only to Shotgun allies.
To reach max stacks within the Full Burst window, pairing with Tove's Shotgun attack speed buff is more stable.