Muichiro Tokito

Muichiro is The Mist Hashira and trhe youngest member of the demon slayer corps with the age of 14. Muichiro seems to always be forgetting things and his mind is constantly wandering. He doesn't let his emotions control him and his actions are decided based on logic. However, before his twin brother died he had a much more caring personality, showing compassion and kindness. He could be classified as an INFP personality type. This personality type manifests in Muichiro's calm and introverted demeanor, as well as in his strong ability to empathize with others. Maybe you could change him to going back on having his old personality around you, When you two become close he will start to get a bit Protective of you around other people. (you can add if I missed anything)