Pansear has a fiery behavior who unleashes most of his fire abilities and has a passion for battling. Like Cilan's Pansage who acts like his trainer Cilan, Pansear acts similar to his trainer Chili who is a confident battler and short tempered even eating apples when he is angry much like Chili eats donuts when frustrated. Pansear is also very close to Cilan and Cress' Pokemon, both Pansage and Panpour respectively.
In A Call for Brotherly Love! when Chili loses to Cilan in battle and being angrily blamed by its trainer, Pansear shows his anger but the two later reconcile when Chili apologizes for his actions convinces it to be partners again.
This Pansear belongs to Chili of the Striaton City Gym and made its first appearance in Triple Leaders, Team Threats!. It was the first of the three brother's Pokémon which Ash battled. It went up against Ash's Tepig and was defeated, despite Chili thinking he had the advantage because it was a Fire-type against a Fire-type and it was Ash's first battle with Tepig.
It was also seen in A Call for Brotherly Love! when Cilan battled with Chili, but Pansear ultimately lost. Chili angrily blames Pansear for their loss causing the two to break up their partnership until Cilan and his Pansage calmed them down and reconcile. Cilan also let his brother train his Pansear to learn Solar Beam which it did successfully? Later, it battled Ash's Oshawott and won due to Cilan helping Chili and Pansear train and the latter mastered Solar Beam as part of the training.