Cheren is a childhood friend Bianca who lives in Nuvema Town. While he holds a greater knowledge in Pokémon than most, his comments are often witty and intellectual. He also misunderstands Bianca's humor often, to her dismay. Whilst Professor Juniper describes him as being very honest, she also remarks that he can be 'a little difficult'; his impatience in particular is often seen throughout the earlier stages of his journey. He is also described as being quite judgmental by Alder.
The Alexis Saga
Cheren first appeared in BW010 alongside Bianca, beginning their journey in Unova. He receives a Starter Pokémon from Professor Juniper, and begins his journey with a battle against Lexi. Cheren appears sporadically in the series following this, often updating Lexi on his journey and showing off his strength. Cheren represents those who pursue ideals—more precisely, as N pointed out in Chargestone Cave, the ideal of strength. His goal is to become the Champion and he always strives to become stronger, yet the first time that Alder asked him why he strives to become stronger, he was quite unsure of his reasons. He then starts to ponder to himself how to do so—something that Alder said he used to do with his partner Pokémon as well—and what exactly it means to be strong. Alder also remarked that Cheren is a lot like Marshal. By the end of Lexi's journey in Unova, Cheren decided to go back to his home town, deciding to start a new venture that he wanted to keep secret for now.
Cheren returned in B2W2-003 having moved to Aspertia City and having become a Gym Leader after Lenora retired. He also works as a Teacher in the Trainer School there. He returns during Lexi's second stint in the journey a few times, having had breaks from the school.