First try to do a generic toon shader with ink shadow for Eevee, you can add vertex color data or a texture in the color input, to rotate the ink lines you have to add a texture coordinate and a mapping node as it is in the picture.
You have to play with the illumination power to make the shaders work, as default it's a sun lamp, you can also play with the color ramp nodes inside the shader, all the test are made with a default white material.
To do the outline effect you have to setup the solidify flipping normals and picking the 2nd material just like in the example and copy the material and put blend mode in multiply.
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