Honkai: Star Rail Kafka Character Guide

[Single Target]

Deals Lightning DMG equal to 50%-100% of Kafka's ATK to a single enemy.

[Blast]

Deals Lightning DMG equal to 80%-176% of Kafka's ATK to a target enemy and Lightning DMG equal to 30%-66% of Kafka's ATK to enemies adjacent to it.
If the target enemy is currently receiving DoT, all DoTs currently placed on that enemy immediately produce DMG equal to 60%-78% of their original DMG.

[AoE]

Deals Lightning DMG equal to 48%-86.4% of Kafka's ATK to all enemies, with a 100% base chance for enemies hit to become Shocked and immediately take DMG equal to 80%-104% of the DoT. Shock lasts for 2 turn(s).
While Shocked, enemies receive Lightning DoT equal to 116%-318.275% of Kafka's ATK at the beginning of each turn.

[Single Target]

After an ally of Kafka's uses Basic ATK on an enemy target, Kafka immediately launches 1 follow-up attack and deals Lightning DMG equal to 42%-159.6% of her ATK to that target, with a 100% base chance to inflict Shock equivalent to that applied by her Ultimate to the attacked enemy target for 2 turns. This effect can only be triggered 1 time per turn.

Immediately attacks all enemies within a set range. After entering battle, deals Lightning DMG equal to 50% of Kafka's ATK to all enemies, with a 100% base chance to inflict Shock equivalent to that applied by her Ultimate on every enemy target for 2 turn(s).

1) Patience is All You Need

Effects: Increases DMG dealt by the wearer by 24%. After every attack unleashed by the wearer, the wearer's SPD increases by 4.8%, stacking up to 3 times. If the wearer hits an enemy target that is not afflicted by Erode, there is a 100% base chance to inflict Erode on the target. Enemies afflicted with Erode are also considered to be Shocked and will receive Lightning DoT at the start of each turn equal to 60% of the wearer's ATK, lasting for 1 turn.
Notes: Kafka's BiS Lightcone. Increase her overall damage and speed, inflicting enemies with Erode/Shock and giving her a chance to deal additional damage from the Lightning DoT.

2) In the Name of the World

Effects: Increases the wearer's DMG to debuffed enemies by 24%. When the wearer uses their Skill, the Effect Hit Rate for this attack increases by 18%, and ATK increases by 24%.
Notes: Similar to the BiS LC above, the first effect increases Kafka's overall damage but only to debuffed enemies. The Effect Hit Rate in the second effect is not useful for her, but the ATK bonus is.

3) Good Night and Sleep Well

Effects: For every debuff the target enemy has, the DMG dealt by the wearer increases by 12%, stacking up to 3 time(s). This effect also applies to DoT.
Notes: At the highest Superimpose, this LC could rival Kafka's BiS Light Cone.

4) Solitary Healing

Effects: Increases the wearer's Break Effect by 20~40%. When the wearer unleashes their Ultimate, increases DoT dealt by the wearer by 24~48% for 2 turns. When the target suffering from the wearer's DoT is defeated, regenerates 4~6 Energy.

5) Fermata

Effects: Increases the Break Effect dealt by the wearer by 16%, and increases their DMG to enemies afflicted with Shock or Wind Shear by 16%. This also applies to DoT.
Notes: Best F2P LC for Kafka and can easily be Superimposed to S5, increasing her Break Effect and Shock DMG.

6) Eyes of the Prey

Effects: Increases Effect Hit Rate of its wearer by 20% and increases DoT by 24%.
Notes: Light Cone that helps Kafka with her Effect Hit Rate while also increasing her DoT damage. But if you add Sampo to Kafka's team, it's better to use this LC on him instead.