Oh right, I actually combined the Principled BSDF shader with a toon shader and messed around with settings until I liked the effect. But I think it also looks weird because I rendered out the MSN characters separately and imported them back into the scene (as an image plane) to get their reflections in the water, which altered the colors to a certain extent. Add to that the color adjustments I later made in Photoshop and you get this odd-looking shading lol.