I'm not sure what you mean by "they" and "character" here. In general, the tessellation, whether it's constrained Delaunay triangulation or a Lorenzetto style t

I'm not sure what you mean by "they" and "character" here. In general, the tessellation, whether it's constrained Delaunay triangulation or a Lorenzetto style trapezoidation as Pathfinder uses, needs only be done once per glyph and then can be reused for any size. However, note that both hinting and stem darkening for gamma correction distort the glyph outlines in a way that depends on the pixel size, so it's not quite that simple.