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Yprin Yprikushma was the Political and Morale Commander of all human forces during the Human-Forerunner war. She was later killed and implanted into Riser's genetic material by The Librarian. It was her idea to analyze Forerunner technology and tactics gained from humanity's early conflicts with the Forerunners. Technology that bought humanity decades of time against the numerically overwhelming and technologically superior Forerunner military. Despite knowing of her impending execution, she had hoped to warn the Forerunners about the Flood in order to ensure the safety of the rest of the galaxy.
- Halo: Primordium (First appearance)