From Brotato Wiki
Damage modifications are increased by 100%
You can only equip one weapon at a time
Character
One Armed 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 0
Unlocks
Unlocks Focus if you win a game with One Armed:
Starting Weapons
One Armed has the second broadest range of starting weapons in the game. They are also one of the few characters who can start with an Ethereal weapon.
The broad range of weapons allows for scaling off any base stat, except for Armor.
Good weapon choices are weapons that can deal with groups of enemies, such as 
Slingshot, 
Shredder, 
Double Barrel Shotgun and 
Lightning Shiv.
Synergies
| Item | Effects | Notes |
|---|---|---|
| +30 % Damage -3 % Attack Speed for every different weapon you have |
This is a great synergy as One Handed will only carry 1 weapon |
Guide and Strategy
One Handed has triple regular Attack Speed (+200%) and Damage modifications are doubled (+100%). This makes hard-hitting weapons especially attractive (due to the high attack rate), and it means that all damage modifications are very economical.
However, since One Armed can only hold one weapon, it makes fighting multiple targets much harder than with most other characters. Therefore, weapons that have a cleave (piercing) or bounce effect are particularly strong on One Armed. Bounce effects in particular reach across the entire map, because this effect does have unlimited range.
Starting weapon: Lightning Shiv is the strongest option; its damage scales with Melee Damage and Elemental Damage. Elemental damage is more valuable on this weapon than melee damage, so it should be prioritized; if you aim to kill Elites, this requires melee damage, because the elite needs to be focused directly, which mainly causes melee damage.
Important stats: Damage type stats are highly efficient, because their value is doubled. Prioritize both flat damage and %damage highly. Attack Speed is not useless, even though you have a lot of it already, but it does not have the double value modifier, making it relatively more expensive compared to damage. If you use a weapon that scales with Ranged Damage, then look for this stat especially during level ups (upgrades), because the stat is relatively rare in the shop.
If you use a weapon that pierces or bounces (or both), Life Steal becomes an effective way to heal, because all projectiles can trigger the effect on each hit. Your high attack speed will create a lot of opportunities for life steal to happen.
If you use a weapon that does not bounce, Range becomes an important stat for you, because you cannot access the set bonus of the weapon (you can only have one), and therefore do not get the usual set bonus of +50 Range (for 6 guns). High range will increase your damage uptime and therefore DPS, and makes it easier to stay safely away from danger. It will also make your piercing more effective.
Upgrade strategy: Prioritize Ranged Damage, if you can use that, then Armor (both are quite rare in the shop). Upgrades should always be opportunistic, depending on what the options are. Do not tunnel vision on damage.
Item strategy: It is obviously important to upgrade your only weapon to the highest tier (IV) as soon as possible. High Luck can help with finding the later upgrades a bit sooner. Because it is not possible to combine multiple layers of weapon tiers, since you can only hold the one weapon, you require finding the higher tiers as-is in the shop. This becomes more likely with higher Luck.
Items that cause damage ("secondary damage") such as Cyberball, Alien Eyes and Baby with a Beard are very strong on One Armed, because you usually have very high %Damage. These items are only good, however, if their respective base stat is reasonably high.
If your weapon is a Shotgun, then Pumpkin is a key item to look for, because a single one already maxes out the piercing damage from the shotgun.
All items that provide Damage benefits are twice as valuable than normal in the shop. The reverse is true for negative Damage. Items should be chosen accordingly.
Engineering items and the Engineering stat are rather weak, because the items do not profit from your Damage stat, and the stat itself does not have the +100% modifier. Engineering related items should therefore have low priority.
Healing and utility depends on your skill and playstyle, and choice of main weapon.
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