Behavior

Creatures of Rain World vary widely in shape and size, but also have distinct behavior patterns. Although it's difficult to describe the extent of a creature's AI, behavior can generally be divided into several categories:


 * Aggressive creatures, such as Vultures, will actively attempt to kill (and usually eat) the slugcat.
 * Neutral creatures, such as Scavengers, will generally not bother slugcat unless provoked, but may have unique interactions depending on the player's actions.
 * Harassing creatures will attempt to shove and bother slugcat, potentially leading to danger, but will be unable to directly harm the player. While cute, these antics can easily lead to the player being thrown off of a safe platform or even drowning.
 * Fearful creatures, such as Batflies, actively flee from slugcat.
 * Friendly creatures will attempt to follow slugcat without causing harm, and may attempt to save the slugcat from certain threats.

Subcategories
Some creatures can be put into subcategories, describing them further. Here are some of them:


 * Utility creatures such as Squidcada, can be used as “tools” to explore further or avoid predators.
 * Summoning creatures, being Vulture Grubs and Juvenile Noodleflies, will call a separate creature after disturbing or killing it. The summoned creature will kill whatever triggered it’s summoning.
 * Pack creatures, such as Yellow Lizards will stick with their pack and do stuff together.

Reputation
In addition to their common behaviors, certain creatures of Rain World have a reputation system, allowing the player to gain renown or infamy with those creatures. This reputation value can vary by region, but for creatures such as scavengers may be raised for the entire group throughout the game. Actions such as giving gifts (such as food, or pearls for the scavengers) or fighting off predators can raise the player's reputation, while harming the creatures can lower it. Note that reputation changes will only be saved if the player hibernates at the end of the cycle; if a player angers or befriends a creature and then dies, their reputation will revert to where it was at the beginning of that cycle.

If the player's reputation for an individual creature is high or low enough, the creature's behavior around slugcat will change considerably. The table below lists all creatures with a reputation system and their known behaviors.

Use of the reputation system is entirely optional and invisible, players can easily complete the game without ever being aware of it.