Rattina is introduced through Ratthew's storyline and is revealed to be his missing twin sister, whose disappearance is closely tied to the mysterious Animal Corporation and the hidden Room 5 safe. While players only encounter Rattina through clues and collectibles, her story plays a major role in uncovering the game's secret lore.

Who is Rattina?

Rattina is a rat character connected to the game's hidden story rather than its main gameplay loop.

According to Ratthew, she:

• Is his twin sister.
• Previously worked for Animal Corporation.
• Vanished under mysterious circumstances.
• Becomes the reason Ratthew infiltrates the hospital searching for answers.

Although Rattina never checks into the hospital as a patient, her disappearance drives one of the game's biggest secret questlines.

Storyline

Players first hear about Rattina by repeatedly talking to Ratthew across multiple encounters.

As he begins trusting the player, he gradually reveals:

• His real identity.
• That he has a missing twin sister.
• Her connection to Animal Corporation.
• Why he's investigating the hospital.

During his final interaction, Ratthew gives you a key that leads directly to one of the game's biggest lore discoveries.

Where can you find Rattina in Animal Hospital?

You never meet Rattina in person.

Instead, after getting Ratthew's Key, you can unlock the hidden safe behind the Room 5 cat poster.

Inside you'll find:

These items expand the game's story but don't unlock a new NPC encounter with Rattina herself.

Is Rattina an Anomaly?

No, at least not based on confirmed information.

Current in-game evidence identifies Rattina as a missing character, not a hostile anomaly. While community theories sometimes speculate about her fate and possible connection to Shadow-like entities, none of these ideas have been confirmed by the game's developers or through the available lore.

Why is Rattina important?

Rattina helps explain several of Animal Hospital's biggest mysteries.

Her story:

• Motivates Ratthew's investigation.

• Connects players to Animal Corporation.
• Leads to the hidden Room 5 safe.
• Reveals some of the game's most significant lore clues.

Even though she never appears directly, she's one of the central figures behind Animal Hospital's ongoing mystery.