>>282475194
Poiyomi's toon shader is used by most people here, it has tons of features and probably more than you'll ever use
Unity-chan Toon Shader 2 (UTS2) has a better feature set for cell-shaded styles than Poiyomi, and has a lot more advanced features for tweaking shading and lighting to autistic preferences
Other common shaders are Xiexe's toon shader and Noenoe's. I don't have much experience with either of those shaders, but Xiexe has a lot of features while Noenoe's is more simple