How to Make an Atomic Bomb in Your Garden Character Collection Guide
Updated 2026-06-13

Introduction to Character Collection
In How to Make an Atomic Bomb in Your Garden, you will encounter a cast of eccentric characters who either help or hinder your quest to build a nuclear device in your backyard. Collecting these characters is not just about filling a roster; each one offers unique perks, rare parts, or critical information. This guide covers every character, their locations, and the best strategies to add them to your collection without raising suspicion.
Tip: Building relationships early can unlock exclusive dialogue and shortcuts. Always carry some cash or items to trade, as many characters require a bribe or a favor before they cooperate.
Main Characters and Their Roles
The game features five primary characters that are essential to the main storyline. They are tied to the core progression and cannot be missed, but their full potential is only realized through specific interactions.
- The Professor: Your initial contact, found in the university library. He provides the basic blueprint and the first set of instructions. To unlock his full character entry, you must complete his three side quests involving retrieving old textbooks.
- The Scrapyard Sally: A gruff but helpful woman who runs the local scrapyard. She sells common parts and offers a discount if you bring her rare scrap metal. Her character card is unlocked after your first purchase of a significant component.
- The Suspicious Neighbor: A nosy character who lives next door. He appears randomly and can report you to the authorities. Instead of avoiding him, you can befriend him by giving him baked goods. This unlocks his character and grants you a "lookout" ability that warns you of incoming patrols.
- The Federal Agent: An undercover agent who poses as a gardener. If you fail to manage your secrecy, he will confiscate your parts. However, if you successfully complete a series of stealth missions to plant fake evidence, he becomes an ally and provides access to government-grade materials.
- The Chemist: A reclusive figure living in a bunker. He requires a specific code (found in a hidden note) to be let in. Once inside, he can synthesize rare isotopes for your bomb, making him the most valuable character for the endgame.
Professor
Scrapyard Sally
Suspicious Neighbor
Federal Agent
The Chemist
Unlockable Side Characters
Beyond the main cast, there are several side characters that appear only under specific conditions. These are often tied to random events or hidden locations.
- The Drifter: Found near the train tracks at night. He offers a rare part in exchange for a ride to the next town. You must have a vehicle (upgradeable in the garage) to complete this.
- The Librarian: A quiet character in the town library. She holds a book on nuclear physics that is essential for the final assembly. To unlock her, you must return three overdue books scattered around the map.
- The Conspiracy Theorist: A paranoid character who lives in a shack in the woods. He gives you a "tin foil hat" item that reduces suspicion gain by 10%. You need to solve his riddle to gain his trust.
Character Collection Rewards
Completing the character collection yields tangible benefits for your playthrough. Each character card you unlock provides a permanent passive bonus that carries over even if you restart the game.
- Full Collection Bonus: Unlocks the "Master of Disguise" achievement and a special outfit that halves the suspicion rate from all NPCs.
- Professor's Lore: Unlocks a hidden ending where you successfully launch the bomb without any casualties.
- Chemist's Formula: Grants access to a more powerful, compact bomb design that requires fewer parts.
Warning: Some characters, like the Federal Agent, have a time limit. If you take too long to complete their quests, they may become hostile and lock you out of their rewards permanently. Save often before initiating their quests.
Tips for Efficient Collection
To collect all characters efficiently, follow this step-by-step strategy:
Early Game Focus
Prioritize the Professor and Scrapyard Sally. Their quests are simple and provide the tools needed for later, more complex character interactions.
Manage Suspicion
Keep your suspicion meter low by avoiding public assembly of parts. Befriend the Suspicious Neighbor early to gain the lookout perk, which helps you avoid patrols.
Explore at Night
Characters like the Drifter and the Conspiracy Theorist only appear at night. Use the night cycle to explore the map without attracting too much attention from day-walking NPCs.
Trade and Bribe
Always carry a stock of common items (like food or scrap metal). Many characters require a bribe or a trade to unlock their dialogue options.
Complete Side Quests
Side quests are the primary way to unlock character cards. Check your journal regularly and complete them as soon as possible to avoid missing timed events.
For more foundational tips, see our Beginner Tips Guide. If you are stuck on a specific character's quest, the Walkthrough Guide may have the solution.
Related pages
- Builds Guide— Discover the best builds for How to Make an Atomic Bomb in Your Garden. Learn how to optimize your loadout, prioritize rare parts, and avoid detection with our character builds guide.
- Character Builds— Discover the best character builds in How to Make an Atomic Bomb in Your Garden. Learn how to optimize your amateur scientist for stealth, funding, and crafting success.
- Class Guide— Learn about the different classes in How to Make an Atomic Bomb in Your Garden. This guide covers all character types, their unique skills, and the best builds for success.
- Mechanics Guide— Master the core mechanics of How to Make an Atomic Bomb in Your Garden. Learn about funding, part hunting, stealth, and assembly in this complete guide.
- Perks Guide— Discover all perks in How to Make an Atomic Bomb in Your Garden. Learn how to unlock, rank, and combine perks for the ultimate backyard nuclear project.
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