Highlighted weapons are free options.
Kujou Sara is a quickswap support who is able to buff your active character via her Crowfeather mechanic while dealing a decent amount of personal damage. When Kujou Sara uses her Skill, her next Charged Shot will leave a Crowfeather at the target location which explodes after a short while, granting the active character in its AoE an attack buff based on Kujou Sara's Base ATK. Active characters within her Burst's AoE will also receive the same buff or have its duration refreshed.
If building Kujou Sara for personal damage, it is recommended to let her receive the buff provided by her Skill to enhance her Burst, while letting the next active character be buffed by her Burst.
At [C2], you can skip the Charged Shot as her Skill immediately drops a Crowfeather, and save it for later on if you wanna swap back to her to extend her buffs. The CRIT DMG buff provided by Kujou Sara's [C6] cannot be snapshot and is not shown in the attribute page.
For her Skill to generate particles, you need to perform a Charged Shot to place a Crowfeather after casting her Skill. If the Crowfeather explosion hits an enemy, it generates 3 particles.
Crowfeathers dropped through Kujou Sara's [C2] do NOT generate particles.
Weapons here are ranked based on Team DPS to account for Kujou Sara's Buff and Personal Damage.