font
It goes well with FF Tisa, Freight Text, Lettera, Calibre, Gotham Rounded, Copernicus, Geogrotesque, Value, Lora and Quincy CF. If you're thinking about using Circular then try Give 60px a shot for content.
People commonly tag it as portfolio, design, bold, food, big, writing, travel, agency, social and music.
Circular on its own
33 Circular samples