Mixing fonts inside any design can be a ‘dangerous’ idea. If the fonts are too similar then the viewer will feel confused, but if the fonts are too different then it will make viewer feel multiple emotions that fight against one another.
A safer idea is to stick to one font/theme and add a graphic or a few different colors that reinforces the brand’s singular idea.
For brands that have more than one focus, and for designers who are up to the challenge, mixing fonts can be worth the risk…..
a great article on logo from webdesigner depot