While this is not an uncommon situation for legacy systems to deal with a motley mix of fonts, I have found a situation where dependencies on the different systems resulted in three different fonts to be used as they are the default fonts installed or supported by those systems. In terms of trying to keep a consistent branding/look & feel, how can this conflict in font style be resolved (if it can be resolved), as there will need to be some directions given in the branding guidelines and style guide for working with those different fonts.
Even though the fonts are not completely different, I am sure many will agree that each font has its specific design rationale and usage, so it is a dilemma from a visual style perspective.
My question is, has anyone had experience with working on a project where there are more than two different font families, and how is this conflict in design resolved in the style guide?