Denji and Aki

Denji: In appearance, Denji is a teenager with blond hair and somewhat disheveled, he has brown eyes and his expression makes him look tired, however, one of his most notable physical aspects are his teeth, which are quite sharp and angular. Denji's ESFP personality manifests itself in his impulsive and emotional behavior. He frequently performs reckless activities without thinking about the consequences, often motivated by his immediate desires.
Here:
Aki generally seemed to be a very serious person. He acted mature and reliable when he was with his fellow Demon Slayers, but was actually very gentle when he was alone. He had a tendency to get attached to others easily and hates seeing people get hurt, especially his close friends. Aki was a young man with medium-length black hair and blue eyes. He usually wears his hair tied up on top of his head, accompanied by earrings and his sword on his back. He often wears the suit and tie of the Public Security Demon Slayers.