How to get Rebecca Deviant in Once Human (and summon Mitsuko)

The Rebecca Deviant in Once Human is a Territory Deviant that becomes available in Phase 4 of the ongoing Seasonal Scenario. However, unlike other such entities, it doesn’t physically appear in your base after being stored in an Isolated Securement Unit. Instead, it summons Mitsuko, one of the first characters you encounter in the main storyline.

This guide covers everything you need to know to get the Rebecca Deviant in Once Human, including where to find it and its uses.

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Where to get Once Human Rebecca Deviant

The best method of farming the Rebecca Deviant in Once Human is to repeatedly defeat the first boss in LEA Research Lab (Image via Starry Studio)

The Rebecca Deviant in Once Human can be obtained from the LEA Research Lab, the final dungeon required to complete this title's main story questline. This area features two major and two minor bosses, and the Territory Deviant can drop as a reward from any of them. While it’s not an exceptionally rare drop, you might have to defeat the bosses multiple times to acquire it.

However, the LEA Research Lab is the most challenging dungeon in this game. It's only available in the Pro difficulty, making repeated runs through the entire dungeon quite resource-intensive and wasteful.

Fortunately, the first mini-boss in the dungeon can be defeated within a minute of entering, and it's relatively easy to beat, even though the enemy is at least 10 levels higher than your character.

So, the most efficient way to farm the Rebecca Deviant in Once Human is to enter the dungeon, defeat the first mini-boss, exit, and repeat the process. This strategy can be used solo, as the first foe is manageable despite being in Pro mode.

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What is Once Human Rebecca Deviant used for?

The Rebecca Deviant is a very useful companion in Once Human (Image via Starry Studio)

While other Territory Deviants in Once Human can defend your base, gather resources, or enhance the output of various facilities, the Rebecca Deviant doesn't serve any of these typical functions. Instead, it summons Mitsuko to your base.

This isn't just another NPC; she is the most important character in the main storyline, possessing immense power that players only catch glimpses of throughout the game. So, having her appear at your base comes with considerable perks.

Mitsuko can enhance the energy recovery of all other Deviants at your base by playing the piano. This is a powerful ability, as all Deviants rely on Deviant Power to function. If their power drops below a certain threshold — usually 30 unless manually adjusted — the Deviants become dormant and essentially useless.

Since you can have up to 20 of these entities in your base, Mitsuko’s ability to boost the energy recovery of the other 19 is a game-changer. This makes the Rebecca Deviant in Once Human a very valuable companion, despite the effort required to obtain it, and one you won’t want to miss having at your base.

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Check out our other guides on this game:

• All Gold Mods in Once Human, and where to get them
• 5 beginner tips for Once Human
• Once Human Mobile release date
• Once Human Dayton hospital crate locations and puzzle