There are probably a few ways to handle turn a noun into a nickname. Which one makes sense to you? Start with umbrella. What nickname would a mischievous class give it? Keep your contribution short enough for the next person to build on. You can take the idea in a funny or unexpected direction, but keep it friendly and avoid using another member's personal details. Let's see where the replies take it. What would you tell someone who was unsure where to start?