Players looking to interact with Koo, the canine companion in Beast of Reincarnation, can unlock the ability to pet him shortly after their initial encounter with Rangifer and completing a brief flashback sequence. Once these objectives are met, the petting option becomes available within the Cleanse Walker, the game's hub area.
To pet Koo, players should position themselves in front of him until the 'Talk' prompt appears. Selecting this option will open Koo's interaction menu, where 'Stroke' can be chosen. This action triggers a short cutscene depicting Emma petting Koo.
Peting Koo serves a functional purpose beyond simple affection; it is a key mechanic for increasing Emma's Rapport with him. A higher Rapport level with Koo unlocks additional skill slots, enhancing his utility. Conversely, allowing Koo to fall in battle will decrease the Rapport level, though it will not drop below the current rank.
The current Rapport level can be viewed within Koo's interaction menu, which also serves as the interface for assigning Koo to both Item and Skill Research. Regularly checking these research assignments is advised to ensure no valuable skills or items are missed. If no Item Research options are currently available, players are encouraged to explore the game world to find new books containing lost knowledge for Koo to learn.