Onion Skin covers deformers in Toon Boom Harmony, preferring them over bones.

Animators and Rigging artists alike are pretty accustomed to using bones. After all, there are lots of 3D and 2D DCCs that use them. Although it has bones, Toon Boom Harmony has left that workflow behind, relying on deformers instead. 

I know it sounds a little like a step back, but it’s actually quite brilliant. Explaining why is this video from Onion Skin who covers why to use deformers over bones in Harmony.

The tutorial walks through some examples that include creating a turning character and how Toon Boom Harmony deformers work for each sample.