The Gnu is is extremely versatile and offers multiple different set up combinations. 2 people can sit on the long kneeling pillow, which is best for rougher whitewater.
You can hook in an internal row frame with oar locks and a seat. The row frame is good for one person but takes up a lot of the internal space and is cramped for two people and gear.
My favorite way to use the Gnu is one person sitting on the back of the boat and one person up front on a gravity grip turned sideways. Two people can use either canoe paddles or kayak paddles. Kristy and I prefer the two kayak paddles for a few reasons. One is that if one person hooks into a fish the other person can take full control of the boat with a two blade kayak paddles as opposed the canoe paddle. I have 140cm paddle and Kristy uses a 110cm.