FloraHas Favorite Item

Her Favorite Item made her a top-tier Burst 2 supporter.
She concentrates large Increased ATK based on caster's ATK on adjacent allies and also gives all allies Increased ATK, increased DEF-ignoring damage, healing, and shields, so she sees use in story, Tower, and Raids alike.
Her Burst Cooldown is 40 seconds, so she needs another Burst 2, and DPS units must sit beside her, but she is especially valuable on accounts without Crown.

From the start of battle, she and adjacent allies get Peace of Mind, healing every second. On entering Burst stage 2, Peace of Mind allies' Max HP rises for 2 seconds; at this point adjacent allies' HP ratio drops below 90%, applying a shield to all allies, and when the shield applies, Peace of Mind allies get Increased ATK based on caster's ATK for 10 seconds. When adjacent allies reach max HP, all allies also get increased DEF-ignoring damage for 10 seconds.

Her Burst Skill heals all allies and grants increased DEF-ignoring damage and Increased ATK based on caster's ATK for 10 seconds. So adjacent allies receive both her S2 Increased ATK and her Burst Increased ATK. Every 100 normal attacks, the stack count of stackable buffs for all Electric allies rises by 1.

Leave her on auto by default.
Most of her Increased ATK based on caster's ATK comes from Flora's Burst, so in squads with two Burst 2 Nikkes, set the order so Flora's Burst lands in the Full Burst where the main DPS concentrates firepower.

Her healing and shields scale with the caster's final Max HP, so use the Vigor Cube first, and the Resilience Cube to keep her Machine Gun firing.

Her all-ally Increased ATK and increased DEF-ignoring damage are on her Burst, and her shield and adjacent Increased ATK are on S2, so raise those two skills to 10 first. S1 triggers healing and the Max HP increase, so level it last.

In story and the Missilis Tower she covers healing, shields, and Increased ATK together, and in Solo Raid she serves as the Burst 2 for DEF-ignoring squads and Electric squads.

She grants adjacent allies both her S2 and Burst Increased ATK based on caster's ATK.
One Nikke covers increased DEF-ignoring damage, shields, and constant healing.
She takes over the Burst 2 ATK buffer role on accounts without Crown.

Her Burst Cooldown is 40 seconds, so you need one more Burst 2 unit.
Her S2 Increased ATK only applies to adjacent allies, so DPS units must be placed on either side of Flora.
Most of her Increased ATK comes from her Burst, so the effect drops if Burst timing slips.