Tuk

Found scavenging in the Royal Waterways, behind a breakable wall in the upper-right corner of the area. Tuk is there to search for a currently unknown character, hoping that they will offer their apologies.

Tuk sells Rancid Eggs to The Knight for.

In Steel Soul Mode, Tuk is infected and cannot be bartered with for eggs, likely due to the fact that Rancid Eggs are used to generate Geo with Steel Soul Jinn. Tuk cannot be interacted with, only one Rancid Egg is found on its body.

Tuk will not offer a Rancid Egg if the Knight has 80 or more eggs in its inventory.

Location
Tuk is found in a secret area in the Royal Waterways.

Trivia

 * Tuk was designed by Emily Doolan, a Kickstarter backer.
 * In the official comic, Quirrel comes across a bug similar to Tuk, though with a different outfit. This bug refers to itself as "Boon." This could be the person Tuk is searching for.

Тук