On 9 December 2025, it will have been exactly 400 years since Ubbo Emmius, the founder of the University of Groningen, passed away. In his tracks, various people who worked and studied there through the centuries made the UG a brighter place. Some of them have been exceptionally important, due to their remarkable achievements, ideas, and activities. This series sheds a light on some of these ‘Colourful Characters’.