Daisy started with the lowercase c. I liked the idea, that the counter consisted only of a thin line, which basically defines the drop shaped terminal. Most extreme heavy typefaces are sans serifs without any contrast. But would it also be possible to create a extreme fat typeface based on classic old face letterforms?
Since the counter forms are fixed by the thin line, other factors like line thickness and letter width must be more flexible in order to create a harmonious alphabet. Ligatures and alternate letters expand the typographic possibilities.