He wears a blue jumpsuit with an arrow pointing upwards with two lightning bolt-like shapes pointing towards his shoulders. The jumpsuit has a belt with the letter 'G' on the buckle. He also wears white gloves and boots.
At age 54, he wore a bunny-eared hat and had a more muscular body. At age 60, he wore a cap with devilish horns and eyes, gloves, a black bodysuit with a matrix-pattern, what seems to be briefs over it and a belt with the letter "G" as the buckle.
He is very calm and analytical, as he was able to deduce that Doflamingo had an ulterior motive for his supposed abdication. He always emphasize the letter "G" in words and even going so far as to motion it with his hands.
He seems to be rather senile in his old age, such as when he went back into the elevator that he had just left instead of going to the Toy House. Additionally he appears to be long-sighted, as he needed glasses in order to spot Kabu up close. This doesn't seem to affect his fighting capabilities however, as he was able to swat him away quickly and with minimal effort.
He has his own laughter style: "Fafafafafafa".
Lao G was already a member of the Donquixote Pirates, at age 54, when a 10-years old Trafalgar D. Water Law joined. After Law had been with the crew for about a week, Lao G was seen having a meal with the other members of Doflamingo's "family". The crew then learned that Law was sick with the Amber Lead Syndrome and heard how Law escaped the extermination of Flevance. While out on a raid, Lao G and Gladius explained to Baby 5 about the country of Flevance and how its people were inflicted with the Amber Lead Syndrome.
After Law was made an official member of the crew, the Donquixote Pirates spread their influence as they traveled to the Grand Line. They participated in various activities such as looting, making business deals, and collecting bounties. Lao G was also instructed by Doflamingo to teach Law hand-to-hand combat skills.
Six months after Corazon and Law left the crew, the Donquixote Pirates plotted to steal the Ope Ope no Mi from pirates who were going to sell it to the Marines. They later arrived at Minion Island and were informed by Vergo of Corazon's treachery.
While Doflamingo covered part of the island in his birdcage, the Donquixote Pirates raided and looted the Barrels Pirates' hideout. When they found Corazon, they viciously attacked him until Doflamingo arrived. Buffalo and Baby 5 later informed Doflamingo that the Marines stationed at the island took custody of a boy. Thinking that the boy might be Law, the Donquixote Pirates left Corazon for dead and prepared for departure. Before they left the island, they found themselves under fire by Tsuru's squadron.
He participated in Doflamingo's takeover of Dressrosa. After Monet opened the gates to the royal palace, the Donquixote Pirates stormed the palace.