Tristan is a light blue-haired squirrel mink with tan fur, a dark patch on her forehead down to her nose, and a large bushy brown tail with two dark stripes down the center.
She wears a frilly yellow blouse with short puffy sleeves, a pink skirt with two layers, and red pumps.
Her nurse's uniform is a light-pink minidress and a light-pink cap with a cross on it (a red horizontal stripe in the anime).
Tristan is shown to be a friendly mink to those who are kind to her and her tribe. As a nurse, Tristan does her job in tending to the injured, though she believes that doctors like Miyagi should not be overly enthusiastic when tending to their patients or learning from other doctors.
Abilities and Powers
After the Beasts Pirates' attack on Zou, Tristan was being chased by Sheepshead when she encountered Sanji, Nami, Tony Tony Chopper, Brook, Momonosuke, and Caesar Clown. After Sanji's group tripped Sheepshead's alligator by covering the ground in ice, Tristan ran away from them, having been scared by the presence of a talking skeleton and dragon.
After the Straw Hats fought off the Beasts Pirates, they wondered where Tristan had run off as Tristan watched them from behind a tree.
After Caesar neutralized the poison gas, Wanda attacked Nami, thinking that she and her group were with Jack, but Tristan and Pedro calmed her down by revealing that they were not the enemy. With Chopper directing them, Sanji's group and all the minks that could move began to treat the injured.
Later, as the minks continued to recover from the Beasts Pirates' assault, Tristan observed that Sanji seemed to like greeting people as he went around displaying affection toward the female minks.
Four Emperors Saga
When it was reported that Duke Inuarashi had woken from his coma, Tristan followed Chopper and Miyagi to tend to him while telling Miyagi that he was being too enthusiastic. At the duke's home, Tristan, Miyagi, and Chopper tended to the duke until Wanda brought the rest of the Straw Hats. When dusk arrived, Tristan and Miyagi fell asleep.
Wano Country Arc
During the raid on Onigashima, Tristan and Miyagi arrived at the Live Stage to assist Chopper in mass-producing the antidote for the Ice Oni virus. After mass-producing the antidote, Tristan and Miyagi distributed the Chopperphage via a cannon. Tristan, Miyagi and Chopper were later handed over a bandaged Zoro by Sanji, given the task to take care of Zoro. As a side effect due to his Rumble Ball's new enhancements, Chopper's body turned into an infant hybrid form, which led to him being carried in Tristan's hands. Tristan would then witness Miyagi inject Zoro the special instant recovery medicine the Minks possessed and was surprised when Chopper reverted back into his normal form, plopping out of her hands. She was later assisting Chopper alongside Miyagi when Chopper was overwhelmed by the amount of patient he had to treat after the raid.
- Her romanized name, Torisutan, contains risu, the Japanese word for squirrel.