Stats

Armor, magic resist, mana and attack speed are the same at every star level.

Neeko

1 star: Neeko's frog hops 3 times from enemy to enemy, dealing 80 magic damage in a small area each time. The final hop is empowered and deals 160 magic damage in a large area instead.
2 star: Neeko's frog hops 3 times from enemy to enemy, dealing 120 magic damage in a small area each time. The final hop is empowered and deals 240 magic damage in a large area instead.
3 star: Neeko's frog hops 3 times from enemy to enemy, dealing 360 magic damage in a small area each time. The final hop is empowered and deals 720 magic damage in a large area instead.

3 patches changed Neeko, read out of Riot’s game files.

Patch 13.11
- Damage75 / 110 / 30080 / 120 / 3601★ / 2★ / 3★
- Bonus damage150 / 225 / 700160 / 240 / 7201★ / 2★ / 3★
Patch 13.8
- Hop Blossoms rewritten
  Before
  Neeko's frog hops 3 times from enemy to enemy, dealing 110 magic damage in a small area each time. The final hop is empowered and deals 225 damage in a large area instead.
  After
  Neeko's frog hops 3 times from enemy to enemy, dealing 110 magic damage in a small area each time. The final hop is empowered and deals 225 magic damage in a large area instead.
Patch 13.7
- Damage75 / 110 / 20075 / 110 / 3001★ / 2★ / 3★
- Bonus damage145 / 220 / 600150 / 225 / 7001★ / 2★ / 3★