From Brotato Wiki
Luck
You have an x% more chance of finding items or consumables when you kill enemies. Also increases the rarity of the items in the shop and level upgrades. There is no limit to luck but there may be a soft cap. If it is negative you lose x materials and XP at the end of a wave. Does not further scale downwards.
Check Shop to see Luck's effect on shop rarities
Items
The following Characters have a higher chance to find these items in the Shop: 
Lucky
| Name | Rarity | Effects | Base Price | Limit | Unlocked By |
|---|---|---|---|---|---|
| Tier 3 | +8 Max HP +3 HP Regeneration -8 Luck |
85 | |||
| Tier 1 | +25% chance to deal (25% ) damage to a random enemy when you pick up a material |
25 | |||
| Tier 2 | +25% XP Gain +3 Melee Damage -8 Luck |
50 | |||
| Tier 3 | +15 Luck +18 Harvesting -5% Attack Speed -3% Crit Chance |
75 | Win a run with  Entrepreneur |
||
| Tier 3 | +20 Luck +6% Dodge -2% Life Steal |
65 | |||
| Tier 2 | +25% chance to deal (25%) damage to a random enemy when an enemy dies |
35 | |||
| Tier 3 | +10% Speed +3% Life Steal -8 Luck |
65 | Win a run with  Speedy |
||
| Tier 1 | +10 Luck -1 Elemental Damage |
25 | |||
| Tier 3 | +30 Luck -2 Melee Damage -1 Ranged Damage |
75 | Win a run with Lucky |
||
| Tier 4 | +10 HP Regeneration +2 HP Regeneration every 5 seconds until the end of the wave -10 Luck |
95 | Win a run with  Doctor |
||
| Tier 2 | +5% chance to double the value of picked up materials +6 Luck +2 Engineering -5% Damage |
40 | 20 | ||
| Tier 1 | +3 HP Regeneration -2 Luck |
25 | |||
| Tier 4 | +12 Max HP +25 Luck -5% Damage |
100 | Win a run with  Pacifist |
||
| Tier 4 | +3 Max HP +2 HP Regeneration +1% Life Steal +5% Damage +5% Attack Speed +3% Speed +3% Dodge +1 Armor +5 Luck |
95 | Win a run with  Well Rounded |
||
| Tier 1 | +10 Luck -2% Damage |
28 | |||
| Tier 2 | +20 Luck -2 HP Regeneration |
48 | |||
| Tier 1 | +4% Speed -6 Luck |
15 | |||
| Tier 4 | +10 Elemental Damage +20 Luck -5 Engineering |
90 |
