Here are some national flags I designed as fan art. Mostly based on the lore in the game plus a little headcanon of mine. Hope you'll like it! :D

Amagal takes pride in their magic, so it's only natural for them to emphasize such in the flag. 

The color consists of purple, yellow, blue & red, which is also the color used by their soldier's uniform. Purple, the color of those magic ore, and the magic circle in the background represent that Amagal is the land of magic. The staff in the center, like a flower growing out of this land, represent all the great mages who grew up in Amagal. The two quills, like the "leaves" of the flower, represent these mages were nurtured by the all-around magical education of Amagal. Finally, the gem on top of the staff represents all the heroic magical achievement Amagal mages had bestowed upon this world.

The flag of Begus is designed based on their religious nature. The yellow light shooting in all directions represent God's blessing in this world. The stars represent the Angels while the octagons (minerals) represent the Dwarfs. The cross in the very center not only represents God himself but also represent Human since, in my headcanon, their religious teaching goes that “God created mankind in his own image”. That's why the cross has two additional "legs".

“…Then God said, “Let us make mankind in our image, to be like us. Let them be masters over the fish in the ocean, the birds that fly, the livestock, everything that crawls on the earth, and over the earth itself!” So God created mankind in His own image; in his own image God created them.”

Dorgania is a bit tricky because originally Dorgania didn't situate in where they are right now. Since I couldn't design their "original" flag without knowing how their "old" culture & environment is like, I can only headcanon that they changed their flag after they migrated & conquered their current home.

The monster on the flag is a combination of Dacian Draco, Sandworm, and Bahamut. Dacian Draco represents their military might. Sandworm represents their desert culture. Bahamut, a mythical sea monster from Arabic legend, represents their maritime culture in the north.

Dorgania flag may look rather bland compared to other countries. This is intentional because judging from the lack of decoration in their palace you can see Lancafew royalties are a pragmatic bunch who wouldn't bother with extravagance. I can imagine they would rather keep their flag design simple so they're cheap to produce since they're in a place where flags can easily be damaged by color fading from the desert sun or got torn during the constant battle with monsters on their western border.

Central's flag contains the most color, which represents their colorful environment and various kinds of species who are welcomed there.

I can imagine the difficulty of ruling a country with the most resources but lacking a strong military to defend them, especially when surrounded by envious neighbors. The half-dragon, half-dove represents the wish of all rulers of Central: having the strength to crush the enemy but also the diplomatic wisdom to maintain peace, neither overly idealistic as Begus nor overly materialistic as Dorgania. The six-color scale/feather on the body represents 6 of the most crucial regions in Central: Aldylen, Parverhill, Witton, Calbridge, Thremten-Red Keep region, and Havana-Acadamy region. The yellow lines in the background represent "All roads lead to Central" since Central is the literal crossroad between the neighboring countries.