Responses
They're personality types which are part of MBTI (Myers Briggs Type Indicator). There are total 16 types.
I recommended you read this article for starters!
https://www.psychologyjunkie.com/2015/07/24/what-is-the-mbti-an-intro-for-beginners/
Now this is gonna be weird, because of the nature of the post. I'm an MBTI freak...
Can anyone please recommend manga (both BL and non-BL) where the MC is:
1. INFJ
2. INTJ
3. ISFJ
4. INFP
Yeah, I know, it's very unconventional. Please don't bash me, I just want to know how those personality types act in manga.