Pekoms is a combatant of the Big Mom Pirates and a lion mink. He is partnered with Tamago, and both are responsible for collecting the monthly payment of sweets from Fishman Island in exchange for Big Mom's protection. Pekoms is a small lion mink. Because of his beady eyes, people often consider him to be cute when he removes his sunglasses, even when threatening someone. He often holds his fists up in a confrontational manner. Despite having large paws for hands, his feet are evidently small enough to fit into the small boots he wears. He wears a pink suit, black sunglasses, a silver earring on his left ear, a sword on his right hip, and wears black high-heeled boots with white ruffled brims. Pekoms has a short temper, as seen as when he was in a fit of rage when he was first introduced. He lifts up his sunglasses while threatening people, but because of his "cute" beady eyes, he does not look frightening. Like many other members of the crew, he seems terrified of Big Mom.
He carries around a list of bounties on wanted people such as pirates and takes note of the people he has seen on bounty posters, as seen when he took the time to look up Caribou even when the latter was about to fire at him with a gatling gun. He acknowledges that merely possessing a Logia-class Devil Fruit does not make the user invincible, commenting that anyone who thinks so will have a swift downfall. He also has a strong attachment to his former home as shown when he offered to let the Straw Hats go when he found out they saved the Mink Tribe from Jack. He was even willing to lie to Big Mom to help them. According to Wanda, he used to be known as a delinquent on Zou. Like several members of the Mink Tribe, Pekoms has a quirk related to the behavior of the animal he resembles. In his case, he adds a roar ("gao") to the end of most of his sentences. Pekoms is deeply afraid of Big Mom, and fears her so much that he hesitated in answering a phone call from her. Pekoms apparently respects Tamago as his crewmate and partner, as the two of them get along relatively well. They are tasked with collecting the monthly candy tribute from Fishman Island for Big Mom. He addressed Capone Bege as a newcomer when the two were sent together on Zou. It seems like Bege doesn't care much about Pekoms as he shot him in the back after seeing that Pekoms is willing to let his personal feelings get in the way of their mission. Bege also told him that they no longer need someone like him. In spite of Pekoms' tendency to issue obvious threats, the citizens of Fishman Island consider him to be "cute" rather than intimidating. Pekoms did not show any concern with the civil war that Fishman Island had to contend with. When the Minister of the Left explained to him about how the Candy Factory was damaged during the coup of the New Fishman Pirates, Pekoms just states that the Big Mom Pirates are not responsible for the civil war and expects the citizens to fulfill their payment. In spite of Pekoms' coldness towards Fishman Island, the citizens showed genuine concern for him when he was gunned by Caribou only to realize that his status as a fighter for one of the Yonko is well-deserved once he retaliated and quickly defeated Caribou. Pekoms has an amiable relationship with his fellow minks as he was terribly shocked when he found his homeland in ruins and overjoyed when he found his fellow minks alive and well. The minks, in turn, welcomed him back with open arms.
When meeting Luffy, Zoro, and Sanji on Fishman Island, he was angered by the Straw Hats eating his captain's candy. Later, when he encountered them near Dressrosa, he and the rest of his craw attacked them in an effort to capture Caesar Clown. During the failed attack, the Straw Hats escaped, but the Big Mom Pirates heard of their destination and followed them to Zou. When he saw the results of Jack's attack, he suspected the Straw Hats. But after hearing the full story, he thanked them and offered to lie to Big Mom to let them escape despite Bege's protests. Due to Jack destroying his hometown, Pekoms holds deep resentment for the pirate. He, along with Tamago, is responsible for collecting the candy payments Big Mom demands from the islands under her protection. While the full extent of his abilities is unknown, Pekoms has proven himself to be quite agile and strong, as shown when he dodged and defeated Caribou, a Logia user who is also a new super rookie with a bounty of Beli210,000,000, with a single punch, breaking the latter's weapon in the same instant. As a member of the Mink Tribe, Pekoms, like all other minks, is a born warrior. It is currently unknown if he is able to use Electro like the rest of his species. Pekoms admitted that he is a Devil Fruit user, and apparently has eaten a Zoan-type fruit which grants him the ability to turn into a tortoise, revealed when he transformed and hid within the shell in order to block an attack by Caribou. The shell is very resilient, as it took many bullets from a gatling gun and did not show any signs of damage afterwards. As a side effect of retreating into his shell, Pekoms' clothes slide out his shell because there are no limbs holding them in; he has to manually slip his limbs back out and readjust his clothes when reverting to his natural form. Pekoms was able to hit Caribou, a Logia user, sending him flying backward with tremendous force, demonstrating the use of Busoshoku Haki. Two days before Luffy's group reached Zou, Big Mom's ship arrived at Zou after following the Thousand Sunny group. Pekoms told Big Mom that he was going to retrieve Caesar Clown because Zou is his homeland. Pekoms and Capone Bege then went to the island. Pekoms was in shock to find his homeland in ruins. However, he was overjoyed to find his fellow minks, who explained how the Straw Hats saved them after Jack's attack. In gratitude, Pekoms was going to spare the Straw Hats in exchange for Caesar. Annoyed that Pekoms was letting his emotions overrule their mission, Bege shot Pekoms in the back. When Nekomamushi appeared behind Bege and questioned why Pekoms was injured, Bege was forced to retreat, leaving Pekoms behind.