flags

Colonies-
ENGLISH
Devonia (capital in Rio)
Andresia (capital in Mexico City)
English West Indies (leeward isles)

basically a royal ensign with something relevant as the arms

GERMAN
Rheinia (capital in South Carolina)
Buchtland (capital on Newfoundland)
Ostendland (capital on Trinidad and Tobago)

FRANCE
Nemours (governate of Mexique, a Valois absolute monarchy in northern Mexico)

Independent-
SPANISH, NEW
Hispaniola (capital on Cuba, pretty much a Greater Antilles Federation)
Oregon (a Spanish Alaskan colony)

PORTUGUESE
Federation of New Portugal and Lavrador (pref. NP on the top/left, lav on the bottom/right)
Portucale (Portuguese Central America)

do whatever looks fun, these are the ones that I'll leave for later because the Americas are dull

Other flags:
Scotland-Ireland
Genovese Monarchy
Bohemia-Hungary?
English-led France

all of these are low priority