Blu

Blu (Officer Blu) is Libelle's and Nanu's first Pokémon, being given her by his mom. She is an honorary Interpol officer because she can sense things that Naomi and Nanu can't sense and because of her bravery. She is larger than most Persians, possibly making her a Totem Pokémon.

Description
Blu is brave and will do anything to protect Nanu, including looking for him and rescuing him. She seems to care about the other officers, rubbing her head or tail on their legs, however; she doesn't trust strangers. She doesn't act all high and mighty like other Persians but does hate it when her coat gets dirty. Despite being carnivorous, she loves malasadas and will cry for them until she gets one. She seems to understand what guns do and will back off whenever someone has one in their hands. She is sleek and lithe, able to run in large strides while barely touching the ground.

Before Stanford
It is unknown how Nanu obtained Blu, but it is his first Pokémon.

In Stanford
She was shown lying down on the bar stand on Cassidy and Émile's flight. She appears to not like certain people, growling at the two. Nanu tells them to not mind her. She backs off when Cassidy points a gun at her.

Before Nanu's Revenge
She was given an honorary title of Officer Blu and is officially an Interpol officer, despite not being human. Naomi awarded her this title.

In Nanu's Revenge
In chapter 2, Blu tracks Nanu down and is able to carry him back to his house. She is shown to hate the rain and will run as fast as possible to the nearest shelter. She loves lab-based chicken and will constantly beg for it, despite it being expensive.

In chapter 3, she is glad to see her old collar back with the Alolan Interpol's logo on it. She is also shown to love malasadas.