iDoll Flower

A Burst 1 Wind Rocket Launcher who lowers enemy ATK with her last bullet and skills, and uses her Burst to deal damage to and taunt the single enemy with high final ATK.
She has no core use in story or bosses, and does not appear in top PvP teams either.
With R rarity, she has almost no investment value next to top debuffers and tanks.

When the last bullet hits, that enemy's ATK drops briefly, and S2 lowers the ATK of the single enemy with the highest final ATK even more. Her Burst deals damage proportional to final ATK to the same target and taunts for 2 seconds.

After a Charge shot, empty the magazine before reloading so the last bullet hits.
Use S2 to lower the ATK of the enemy with high final ATK, and use Burst when you need a taunt.
Keep her on auto, and adjust reloads only if the last bullet often misses.

There is little evidence in the recent meta for pairings that run her in the same squad.

To apply the last-bullet debuff often, adjust reload with Resilience Cube. She has a Defender stat profile, so Endurance Cube and Vigor Cube are secondary. If Harmony Cube levels differ a lot, use the higher-level cube over the ranking.

As an R Nikke, Overload investment has low value. If you use her, prioritize Rocket Launcher Charge Speed and Hit Rate, and add only a few Burst damage lines.

She is not a meta core, so she barely uses skill books. If you must, raise Perennial PerfumeB, Hue of the Perennial2, then Perennial Leaf1.

She does not appear in top Solo Raid teams. Use her only as a temporary debuffer early on when your roster is thin.

Landing the last bullet lowers enemy ATK.
S2 greatly lowers the ATK of the enemy with the highest final ATK.
Her Burst deals damage to and taunts the same enemy.

Her debuff and taunt are fixed on the single enemy with the highest final ATK.
The last-bullet condition means she must land shots before Rocket Launcher reloads.
An R Nikke with no core use compared to top debuffers and tanks.