From Brotato Wiki
You buy items using Max HP instead of materials
Character
Demon is a playable character in the game. Individual characters differ in their Stats and traits, to encourage a variety of play styles in Brotato.
How to Unlock
Win a run in Danger 5
Unlocks
Unlocks Obliterator if you win a game with Demon:
Starting Weapons
Demon has wide combinations of Melee Damage and Elemental Damage weapon with only 1 Ranged Damage weapon.
They are also one of the few Characters who can start with an Ethereal weapon.
General
Max HP items are usually great on demon, as they provide more Max HP than their cost.
For example, 
Alien Baby gives +15 Max HP for the cost of 6-7 (depending on the wave).
Coupon
Coupon does work with Demon. Each items cost is calculated by 13 material=1 Max HP cost, decimals are rounded, 1.5 cost goes to 2, 1.2 cost goes to 1. Thus, many Coupons may be needed to make a difference.
Examples:
- Assuming 0 inflation for easier explanation.
Blindfold costs 45 materials. Max hp cost 45/13= 3.46 -> 3. You need to have 5x Coupon to change its price to 45*0.7/13= 2.42 -> 2
Charcoal costs 20 materials. Max hp cost 20/13 = 1.53 -> 2. You need to have 1x Coupon to change its price to 20*0.94/13= 1.44 -> 1
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