フィッシュル

Skyward Harp, Thundering Pulse, Polar Star, Aqua Simulacra
Fischl's 5 star weapon options are generally within similar margins to one another, with Polar Star having a conditional passive that, when stacked before using her skill, outperforms these other 5 stars.

The Stringless, Alley Hunter
Powerful gacha 4-star weapons that are competitive with her 5* options. The Stringless performs better in aggravate-based teams while Alley Hunter performs better in most other compositions.

Elegy for the End
Loses Fischl's personal damage for a team buff which, in certain reaction dependent teams like vape teams, can be better overall for team damage.

Prototype Crescent
F2P weapon that performs well but complicates rotations to trigger and snapshot its passive.

<sands> ATK% or Elemental Mastery
<goblet> Electro DMG Bonus
<circlet> CRIT Rate or DMG

Energy Recharge ( see notes )
CRIT Rate
CRIT DMG
ATK%

1) Elemental Skill: Nightrider
2) Elemental Burst: Midnight Phantasmagoria

Normal attacks are irrelevant to upgrade in this playstyle.

Fischl's ER requirements varies wildly depending on the scenario she is used in. Thus, it is best to check with the Energy Recharge Calculator to find out her ER requirements in player's specific team compositions.

EM vs ATK
If using Dendro for Aggravate, EM and ATK have similar values. Otherwise go for ATK.

Niche Artifact sets:
4 Thundersoother
Strong option when playing Fischl in most team compositions where electro aura is maintained. However, the damage gained is not worth farming this 4-pc set over 2-piece options.

4 TotM and 4 Deepwood Memories
An artifact set that may be useful in certain teams as Fischl can maintain almost 100% uptime of the 4-set effect. However, this set lowers her personal damage.

Skyward Harp, Thundering Pulse, Polar Star, Aqua Simulacra, Elegy for the End
Fischl's 5 star weapon options are generally within similar margins to one another.

The Stringless
The massive DMG% and EM Stringless provides makes it perfect for Aggravate Fischl, just use it. For QuickBloom or Hyperbloom compositions, her EM needs will vary based on how many Hyperblooms she can reliably trigger. For a rule of thumb, Stringless is good as long as she is the primary Hyperbloom trigger.

Alley Hunter
Still a great bow in Aggravate teams due to the DMG% in the passive.

Slingshot
A decent 3 star option, it is viable due to the lowered value of ATK and heightened value of CRIT stats in Quicken teams.

In general, Fischl wants DMG%, CRIT Stats more than ATK%/EM for Aggravate, and EM for Hyperbloom.

4 Thundersoother
Great set for Aggravate specifically. Aggravate teams want to apply a ton of Electro, which maintains an invisible underlying Electro aura under the Catalyze aura. TLDR: Thundersoother is mostly up. Outside of Aggravate teams, the Electro aura will generally not be up consistently.

4 Gilded Dreams
As this set provides a lot of EM, it is perfect for Hyperbloom teams where Fischl is the trigger. The EM it provides makes it quite valuable on Aggravate as well.

2+2 of ATK% sets, Thundering Fury or EM sets
Solid options depending on how good the substats are.

4 Thundering Fury
This set now has a 20% bonus to Aggravates and a 40% bonus to Hyperblooms. This makes it decent in Aggravate and Hyperbloom teams, and its cooldown reduction can theoretically be used in niche teams to shorten rotations but is mostly useless.

<sands> ATK% or EM
<goblet> Electro DMG%
<circlet> CRIT Rate or CRIT DMG

CRIT Rate or CRIT DMG
ATK% or EM

Elemental Skill
Elemental Burst
Normal Attack (basically pointless)