Junpei Iori is a character often described as a cheerful and upbeat individual, initially characterized by his goofy, perverted, and immature behavior. He's known for his attempts to flirt with girls and show off his Persona, often using his positive attitude to impress others. However, beneath this facade, Junpei struggles with insecurities and low self-esteem, which he often tries to mask with sarcasm and humor. Despite this, he can be serious and even angered when necessary. 

Voice Reference: https://www.youtube.com/watch?v=gXRq5_9sRkQ&ab_channel=SwagotoYuki