Tinsay is one of the brothers in Tai Bwo Wannai Trio. He is located on Cairn Isle, where it is recommended to have high agility to get across safely. During the quest, he asks for a banana in Karamjan rum, a monkey skin sandwich with seaweed and marinated jogre bones.
Tinsay used to be a priest before he went mentally insane. His insanity was caused, according to his father Timfraku, by some jogres, but he mentions no more of it. Presumably, a jogre banged him on the head with its club and sabotaged his brain.
After completion of the Tai Bwo Wannai Trio he can be found in the southernmost hut in Tai Bwo Wannai. Speaking to him after the quest will prompt him to teach the player how to cook karambwans granting 5,000 cooking experience, as well as allow you to pray at the Tribal Statue.