From Brotato Wiki
Demon
Character
Stats
+50% of your Materials are converted into Max HP at the end of a wave (13 Materials=1 Max HP)
You buy items using Max HP instead of materials
You buy items using Max HP instead of materials
Unlocked By
Win a run in Danger 5
Unlocks
None
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.
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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