"Logical but also passionate, Litten always remains coolheaded and doesn't show its emotions on the surface. Its fur is rich in oils and immensely flammable. Litten grooms itself by licking its fur, and then uses the collected fur as fuel for fireball attacks. When the time comes for Litten to shed its old fur, it all burns up in a glorious blaze."
Litten first appeared in A Fiery Kitty! when she was causing mischief in Hoenn. Unknown to Lexi and her friends, they chased after her, who had ran away upon being spotted. Despite putting up a good chase, it was easily defeated by Lexi's Shuppet. Soon afterwards, Lexi discovered that Litten was just scared due to it's unfamiliar surroundings, after a young boy revealed that Litten was apart of a litter that he brought back to Hoenn with him from the region of Alola. Taking a liking to her, Lexi asked about having her as her own, which the boy accepted, thus partnering Lexi and Litten for the first time.
Following her capture, Litten appeared every now and again, escaping her PokéBall to see whatever sights that Lexi and her friends were seeing. Because of Litten, Lexi decided to head to Alola after finishing her journey in Hoenn.
Litten is only one of three Pokémon Lexi had on her team in Alola. During their time, Litten remained outside of its Pokéball and stayed close to Lexi's side. She begun aspiring to evolve, and worked hard in order to become stronger. As their journey progressed, Litten was led to grow up fast as the threat of Team Rainbow Rocket loomed.
Litten remains on Lexi's team when the afromentioned headed to Galar. Like Lexi, she seems more hardened when first seen, seemingly intune with her Trainer. Because of the ordeal, after battling with Milo, Litten expresses its desire to remain in its unevolved state, refusing to evolve after the battle - leading Lexi to give her an Everstone to stop the process.
Litten remained outside its Pokéball for most of the series. In her time with Lexi she was used often during battles. Litten was present during the battles against Milo, Bea, Allister and Melony. When Lexi battled against Melony , she sustained a frozen injury that put it out of action. Due to this, Litten was sent to Hayley's Ranch to recuperate. She later returned during Lexi's Pokémon League battles.
Litten is a mischeivious and cunning Pokémon, but is also sweet and kind to those it finds likeable. She and Lexi quickly bonded upon becoming partners, which exposed Litten's playful and caring nature; however, to foes, strangers and those she dislikes, Litten often plays tricks and snubs them, not having any desire to interact with them.
In terms of battling, she often seems to be very confident, however, if she is winning or finds herself stronger, she becomes cocky, which results in her becoming careless and causes her to fail dodging attacks and being hurt. Despite this, as soon as she feels her opponent has the upperhand, her focus returns and she's agile and strong with her attacks and defense, proving to be a worthy battler.
Litten, although still young, has learnt the ability to build up fur inside her stomach that is then set alight and fired at foes.