"These Sand People may be violent, but they have a society and customs. I know ways to make them leave you alone, if you weren't too ignorant to listen!"
- Larcoh to two citizens of Outpost Largona

Professor Larcoh was a male Selkath, who lived on the world Tatooine during the Cold War between the Galactic Republic and the resurgent Sith Empire. He was one of the few of his species that lived away from their species' homeworld of Manaan after most of their species had been forced underwater in the bombings of the planet. Around the time of the Cold War between the Galactic Republic and the resurgent Sith Empire, the Professor traveled to the world of Tatooine, in order to study the society and customs of the Tusken Raiders, a native species of the planet. The Professor resided at Outpost Largona, which was subjected to frequent attacks from the Tusken Raiders. There he was able to study a tribe of Raiders that currently resided on the nearby Northern Jundland Plateau, and he braved the desert dangers in order to personally see the society and customs of the Tusken Raiders. Larcoh discovered that the desert dwellers were not mere savages but that instead of diplomacy, they favored strength. Upon one of his studies he witnessed how the tribes earned respect from each other. One Tusken Raider entered a rival village and placed an object into a totem base. Challengers would then appear and try to defeat this rival, and if the rival won the losers would respect the strength of the winning tribe and avoid them.
Upon this realization, Larcoh deemed it necessary to inform the people of Outpost Largona of how they could stop the attacks from these "Sand People" as the Tusken Raiders were also known. No one, however, listened, and the Professor became more and more frustrated. A team of Republic operatives passed through the Outpost and delighted Larcoh by listening to the Selkath's solution. They were eager to help with a diplomatic solution, but Larcoh informed that the raiders favored strength instead of diplomacy. The Professor gave them the same object that the Tusken Raiders used to proclaim the challenge and instructed them of how to perform the ritual challenge. The Professor told them to go to the camp on the Northern Jundland Plateau and perform it there.
After the operatives had left, Larcoh heard reports of how Tusken Raiders had started to carefully avoid the outpost instead of attacking it. When the operatives returned, Larcoh exclaimed how happy he was that he had been right. The Tusken Raiders were now respecting the outpost's strength, just as he had thought. Although the settlers would not appreciate it, Larcoh predicted that his research would soon make significant headway. He thanked the operatives and stated he would include their names in his research documentation.
Larcoh was proud of his academic title and spoke condescendingly of anyone who would not listen to him by calling them a fool or a rubat. He cared for his fellow sentient beings, however, as he went to lengths to inform the settlers of how they could make the Tusken Raiders leave them alone. He had a mottled pink skin color and black eyes. He spoke his species' language and wore standard traveling clothing while carrying a H2.a1.1 blaster.