Zeri is a very different kind of ADC, she has a very unique and very versatile kit.
In this guide that I'm making for fun, I will try to explain the amazing champion that Zeri is!

Q - Burst Fire
Passive: Zeri's basic attack deals magic damage, scales with AP, and is treated as an ability. Moving and casting Burst Fire stores up energy in Zeri's Sparkpack. When fully charged, her next basic attack will slow and deal bonus damage.
Active: Burst Fire shoots a burst of 7 rounds that deal physical damage to the first enemy hit.
Burst Fire scales with AD and is treated like an attack, with the first round applying on-hit effects. Its cooldown matches Zeri’s basic attack timer.

Her Q basically is her main way of dealing damage like an auto-attack.
This is what her Q and auto attacks do.

E - Spark Surge
Zeri dashes a short distance and energizes her next 3 casts of Burst Fire, causing them to pierce through enemies. She will vault over or grind along any terrain she dashes into, depending on the angle. Hitting a champion with an attack or ability reduces Spark Surge’s cooldown.

The E is a short dash that empowers your next 2 Qs. If done in front of a wall it goes through it. You can also use her W while going through a wall which will be explained now.
This is what her E does.


W - Ultrashock Laser
Zeri fires an electric pulse that slows and damages the first enemy hit. If the pulse hits a wall it fires a long range laser from the point of impact.

Her W is a useful tool that helps with engaging or when you are being chased due to its Slow. Since it has long range (if you use it through a wall) you can use it to execute somebody that is undertower or just far away.
This is what her W does.



R - Lightning Crash
Zeri discharges a nova of electricity, damaging nearby enemies, and overcharges herself for a moderate duration. While overcharged, Zeri gains increased damage, Attack Speed, and Move Speed. Attacking enemy champions refreshes the overcharge duration and adds another stack of Move Speed. While overcharged, Burst Fire's damage concentrates into a faster triple shot that chains lightning between enemies.


Her R is very good in teamfights, if used properly she can turn them around. When you Q somebody while her R is active, it acts like a Statikk Shiv, basically her Q goes through multiple enemies and minions at once. It also gives move speed which is helpful when chasing enemies.
This is what her R does.


Passive - Living Battery
Zeri gains Move Speed whenever she receives a shield. When she damages an enemy shield she absorbs its energy, shielding herself.

With her Passive you counter some champions a little bit like Sett's W and other champions' abilities which grant a shield. It also Counters some items like Immortal Sheildbow, Maw of Malmortius, and many others. Keep in mind that the shield you steal isn't granted immediately, You get it gradually while attacking the enemy.
This is how her passive works.