Quirky Upbeat could be categorized as a latin uncial. "Uncial" because it has one case, of x-height plus ascenders and descenders in the style of so-called uncial and half-uncial fonts. "Latin" because of the triangular serifs which give the font a lively texture.
I love alternate characters and Upbeat has its share. Use these to create variety in your lettering. Located in the lowercase positions.