Once again Cheren isn’t angry or bitter he’s just impatient and goal oriented. He’s envious of the protag in BW because they live his dream and then abandon it but honestly who WOULDN’T be upset. He even tells the protag that he supports them anyway BC he’s a good friend and a nice guy. In BW2 he gets over his impatience and goes out of his way to help the protag and give em advice for the next gym. He’s friendly as heck.
Please love ur Cherens