First of all, the five stars represent the power division system, which proves that the world government is not an organization that practices "dictatorship".
Secondly, the five stars are one of the fig leaf used by Celestial Dragons to cover up his dictatorship.
Finally, in the plot of One Piece, the five old stars should also represent the five oceans that make up the world.
Role description:
1, Ye Ping Zhengren
Wearing a black suit, a head of white curly hair, a fluffy white beard, a flat hat and a scar on his left face.
2. Masutani Yasunori
Wearing a dark blue suit, with long straight white hair and a long beard.
3. Yamane Seiji
Wearing a crimson suit, no bow tie, blond hair, blond beard and a scar on his chest. ?
4. Kenichi Ogata
Wearing a dark green suit, bald, with two beards and a spot on his forehead.
5. Keiichi Sonobe
Wearing a white robe, bald head and glasses. The only one of the five stars who doesn't wear a suit and has a beard. And holding a knife like sauron's three ghosts.