An AI who was found by the player Yukino as a caterpillar. She cared for him as he wove a cacoon and transformed into a humanbutterly hybrid. The two met frequently but they were eventually discovered by Kamui the leader of The Worlds Debug team. Rin tried to convince Kamui not to delete him saying that his existence had just as much worth as hers but it was a futile effort. Despite Yukinos protest Rin was deleted but not before having a deep effect on Kamui. source: http://dothack.wikia.com