So I asked an AI what different flags of LDU nations looked like (I'll work on images), and this is what it told me:
Liberal Democratic Union - An example of simplified heraldic elements, a tradition which is to some extent typical of other styles such as the flag of Sweden, the flags of Chile, Peru and Suriname.
Romanum et Britannia Minor - Inspired by the flag of the "Free City of Danzig".
Oruzia - Inspired from the flag of the United States, composed of 13 white and blue diagonal stripes of equal width. Another common symbol is the yellow coat of arms of the town Oruzia. In Turkish, the word "oruza" means "orange". Two of the most important landmarks of Oruzia are the Ceral Mountains and the Cerakot Hill.
Potenzia - Symmetrical, with the left side dominated by the red and the right side by the white, and the two colors are alternately sewn together in horizontal stripes. The five pointed star on the left is the Maltese cross, and the key is the heraldic symbol of the city's original name, Potenzia San Giuseppe.
Sulasburg - Specified in resolution 516/1999 as: "We, as Sulasburgers, wish to represent the roots of our ancestors in the azure colours of the Swiss flag with a yellow 6 pointed star, symbolizing the 7 churches of the town, and the saltire of the canton of Bern.
Madrinpoor - Based on the flag of Spain.
Sjevre - Very different than the flag of Belgium. Before the union of the three municipalities in 1975, their flags were very similar. A mistake was made, however, since the middle of the flag represented Evreux and not Sjevre. To make things worse, the middle of the flag was blue, while the neighboring flag was yellow. The municipal council decided to change the flag because it was incorrect and not in compliance with a law which sets the flag of France in blue and the flags of Belgium and the Netherlands in yellow. The flag is now in use.
Filipinn - Also based on the study of history and mythology of the people. The flag consists of three horizontal stripes that measure 11.4 centimeters long and 2.6 centimeters wide each. The white stripe is the coat of arms of the island, and the red stripe symbolizes blood. And the yellow stripe symbolizes laughter.
Tuthar - Closely related to the flag of Legio VI Victrix (XVII Gemina), a Roman legionary of the 2nd century. Each of these was an eagle on a hexagon and the only visible difference between the two is the red band between the wings. It is not entirely clear what connection the two flags have with each other. The first known reference to the flag of Tuthar is found in a diploma of the Ptolemaic Egyptian Empire. The flag of Legio VI Victrix is closely modeled on the Eagle of Tuthar as pictured above and in an inscription found at the Egyptian pyramids of Saqqara: "The eagle is red, the Naiads white and blue, and the Egyptians black with a cross in their chest; when they do not fly in war the feather falls into the water and divides." This is an early example of an Egyptian flag.